Eh, even in the same paragraph it says "The distinction between function and class components in React and when to use each one leads to disagreements even between experienced React developers."

Also, bits of class issues show up in the other complaints.

So, no, it's not just "what is a class" and it's a weird hill to die on. I feel like most of these responses to hooks in general just focus on the most trivial detail aka bikeshedding.