I don't know why but I keep looking at the sarcastic tone you used for the post as you seething and not you making fun on the reddiots. No clue why.
Anyway, sarcasm aside, I don't really see the ID vtubing industry currently as "booming". It's more of a start, since the things like local ads and collab with local celebs/internet personalities are still relatively recent. For Hololive ID right now, it's currently Kobo and Kaela that gets the ID normie attentions, but as far as I know it, it's still "weeb shit" and still considered as fast-growing minorities among the ID netizens.
As for Raditya Dika himself, eh... he's okay. Comparison was pretty bad, but he's more or less a jack of all trades (Comedian, book author, Film Director/Writer, now podcaster). Just because Kobo and Kaela appeared on his podcast doesn't really mean that Hololive ID (and thus vtuber in ID) is booming, since on the comments on Kobo's episode at least, there are still people commenting about "whoa, Dika is talking to ANIME."
But then again, it is reddit. No idea why you had to focus on this particular one since it's what, some guy talking with Kaela with nothing much to say about it except "ID vtubing getting bigger, guys".
Anyway, here's the video link if anyone's curious (it's fully Indonesian though, so don't go around saying 'I CANT UNDERSTAND SHIET')
(title in EN is: "How do I shoot this?", which relates to the whole 2d talking to 3d thingie and Kaela is in her 3d model form)
Kobo is doing okay. It just that since Kobo is the one that most ID weebs (and honestly anything big involving HoloID at this point), Frz is using her as a example for his sarcastic-posting.
She did appear on the "Raditya Dika" guy mentioned in the reddit post screenshot before Kaela, though.
Yeah its pretty much like that. I believe it was common practice back when YT Superchat isn't recognized for IDs, so either they have to use a way to make it sent superchat not as ID or using local/outside YT alternative. Even after superchat is available in ID, they still use it as secondary source of fans to donate to them, either because of special perks or features tied to it (example: AKA Virtual's ONShannon trakteer donations allows someone to play a video link when their dono is sent and received on stream) or because it's less of a hassle to do so (no need converting money or spending way too much compared to super chat).
So yeah, that pretty much means their actual donation earnings isn't really accurate if you focused on the superchats alone. You might need to go to their alternative earnings and combine it with the superchat to get a clear picture, but to some people that takes too much effort.