I agree with you. I also agree that other people back then did refer to Q as "Qanon" but it wasn't correct then either, even if that's what they said. Q was Q. Qanon then became a twitter hashtag, which makes sense, but nobody who interacted with Q on the chans ever referred to Q directly as Qanon. "Qanon" was always either for hashtag purposes or a mislabeling. The fact that Q made an actual post confirming the proper terminology, should have settled it, but here we are.

Edit: Since there seems to be so much confusion, I will just stick with post 4881, listed above, where Q addresses the issue about as clearly as Q has ever addressed any topic.