The definition of "editorial" is not that it's non-normative, but that it doesn't make any difference to the technical content.
The common-sense definition might be that, but the process definition is:
No changes to text content
Corrections that do not affect conformance
Nothing in a Note affects conformance, so allowing editorial changes (without being more specific) allows rewriting the entire Note. We don't want that. We probably need a better definition of “editorial change” that makes sense to apply to documents other than Rec-track documents, but that's a separate issue
As discovered in https://github.com/w3c/w3process/issues/532#issuecomment-842940661
This is this issue.