I originally read your comment as quite gatekeep-y and elitist. The article explained some of the "theory" behind certain things around music in a way that made sense to me, yet here was a professional telling me it was bad because it was bad.

However I've realised that "Music Theory" is a strictly defined term. If someone made an article called "Intro to Algebraic Geometry", and it was actually about geometric algebra, it'd be really annoying, even if to a uninformed person the meaning behind those terms would seem interchangeable.