Where. I keep reading it over and over and the only one I can find is someone derisively commenting on “the same way it applies to other streamers”.
Twitch guidelines are basically written in such a way that they can just freely do whatever they want and this “rule change” seems to continue in that spirit, singling out vtubers.
Remember when they said Galaxy would get linux support? That didn’t happen, and that promise got quietly retracted…
That said, Heroic is unofficial but has worked quite well.