Haradrim Traditions (script name innovation_haradrim_tradition in the lotr_maa_innovations.txt innovations file) is a cultural innovation (not a cultural tradition, in spite of its name) that unlocks four MaA. It looks like this in-game:
So the first thing that should be addressed is that the description there references Mumakil, which are not part of this innovation. The use of Mumakil is already covered by the Mumakil Domestication cultural innovation that is also available to all the cultures that can get Haradrim Traditions. It appears that this innovation used to unlock Mumakil MaA too, since there are commented out lines for that in the innovations file. This is a minor issue, but changing the localization to more clearly separate these two cultural innovations might be good.
Then we get to the four MaA that are unlocked by Haradrim Traditions. Two of these are given the Skirmishers MaA type (somebody on the Discord questioned this and that's what caused me to look into this whole thing): the Desert Javelineers and the Haradrim Raiders. The Haradrim Raiders are definitely Skirmishers. They have similar stats to the default Light Footmen, they counter Heavy Infantry like other Skirmishers, and the description fits what Skirmishers are usually like.
But the Desert Javelineers look like Archers. Their stats are more like default Bowmen, they counter Skirmishers like Archers do, and their description has them attacking from afar. Other than being assigned type = skirmishers in lotr_haradrim_regiment_types.txt (along with the perplexing comment of # pikemen_unit but skirmishers), there is no reason to suspect that these would be Skirmishers. Were they meant to be Archers?
The other two MaA from this innovation are both cavalry of different kinds: the Serpent Guard and the Camel Warriors. I don't see anything wrong with the Serpent Guard. They're Heavy Cavalry that appear to be Heavy Cavalry in stats, description, and all.
Then there are the Camel Warriors. They have a fitting unit type of Camel Cavalry. They also have another baffling comment in the file of # light_footmen but pikemen. Their stats and costs are also unexpected. They cost exactly the same as Armored Horsemen, the default Heavy Cavalry unit. Their stats are exactly like the Serpent Guard above except for having only 2/3 as much damage. I guess they're meant as a camel version of Heavy Cavalry? The description doesn't mention being armored, though. It just feels all over the place.
Summary of the issues:
Innovation description outdated
Desert Javelineers mistyped as Skirmishers instead of Archers
Haradrim Traditions (script name
So the first thing that should be addressed is that the description there references Mumakil, which are not part of this innovation. The use of Mumakil is already covered by the Mumakil Domestication cultural innovation that is also available to all the cultures that can get Haradrim Traditions. It appears that this innovation used to unlock Mumakil MaA too, since there are commented out lines for that in the innovations file. This is a minor issue, but changing the localization to more clearly separate these two cultural innovations might be good.
Then we get to the four MaA that are unlocked by Haradrim Traditions. Two of these are given the Skirmishers MaA type (somebody on the Discord questioned this and that's what caused me to look into this whole thing): the Desert Javelineers and the Haradrim Raiders. The Haradrim Raiders are definitely Skirmishers. They have similar stats to the default Light Footmen, they counter Heavy Infantry like other Skirmishers, and the description fits what Skirmishers are usually like.
But the Desert Javelineers look like Archers. Their stats are more like default Bowmen, they counter Skirmishers like Archers do, and their description has them attacking from afar. Other than being assigned 
The other two MaA from this innovation are both cavalry of different kinds: the Serpent Guard and the Camel Warriors. I don't see anything wrong with the Serpent Guard. They're Heavy Cavalry that appear to be Heavy Cavalry in stats, description, and all.
Then there are the Camel Warriors. They have a fitting unit type of Camel Cavalry. They also have another baffling comment in the file of 
Summary of the issues:
innovation_haradrim_traditionin thelotr_maa_innovations.txtinnovations file) is a cultural innovation (not a cultural tradition, in spite of its name) that unlocks four MaA. It looks like this in-game:type = skirmishersinlotr_haradrim_regiment_types.txt(along with the perplexing comment of# pikemen_unit but skirmishers), there is no reason to suspect that these would be Skirmishers. Were they meant to be Archers?# light_footmen but pikemen. Their stats and costs are also unexpected. They cost exactly the same as Armored Horsemen, the default Heavy Cavalry unit. Their stats are exactly like the Serpent Guard above except for having only 2/3 as much damage. I guess they're meant as a camel version of Heavy Cavalry? The description doesn't mention being armored, though. It just feels all over the place.