That does seem catastrophically misguided. I’m more curious about the more common case where tags are used as documented (and I really wish the documentation was better), but perhaps not completely. For instance we have a Finder like UI in our web app that conceptually is a treegrid, but we don’t support all of the keyboard interactions advised at the above website.

Should we remove the role attributes?

What would be better for your users? What have you discovered in research?

If you don’t know, and you’re not doing research, your best bet is to match the standardised semantics and interactions as best as possible, or at least have backlogged items to do so.