>proper 2d anime
Probably not, at least not for these humorous videos posted on the channel. Producing them using the 3D stuff is easier and probably funnier for the actual videos, if they did do 2D stuff it probably wouldn't look that great in comparison. A larger project might incorporate 2d animation, however, like that hololive alternate or whatever that was.
Fucking never ever outside of maybe TV promotions for very specific things. Hololive barely pays enough attention outside of the main JP branch as it is, do you think they're going to waste time on the male group that they intentionally designed to be as far away from the girls as possible?
Speaking of which I'm reminded of some guy saying that the Hololive leddit thought at one point Holostars were a different group entirely and thus not to be discussed. Not sure if that's true but I believe it.