The program must include source code, and must allow distribution in source code as well as compiled form. Where some form of a product is not distributed with source code, there must be a well-publicized means of obtaining the source code for no more than a reasonable reproduction cost, preferably downloading via the Internet without charge. The source code must be the preferred form in which a programmer would modify the program. Deliberately obfuscated source code is not allowed. Intermediate forms such as the output of a preprocessor or translator are not allowed.
There are no source files (UFO, glyphs, etc) in this Git repository, only compiled fonts, but the about section says the project is open source.
See section 2 of the Open Source Definition
https://en.wikipedia.org/wiki/The_Open_Source_Definition