“Vtuber” refers to the the virtual persona but also the real person behind the avatar, cf. “Youtuber”, “blogger”. And “avatar” is a much less specific and less informative term than “vtuber”. And anyway the street finds its own names for things.

Well, "the street" also huffs glue.

Yeah, no. We will continue calling it VTuber whether you like it or not. You're also wrong.

Except you haven't managed to show how. So... continue pushing ignorant blather.