I don't know, but I hope not, his channel is based on other people's projects that he sells, in short he's a scammer like a sagelatropus and other fake artist, of which there are many on pixiv, and I admire anyone (sarcasm) who would spend even a cent on scamming.
These are the people who contribute to the fact that many artists give up publishing. (via sagelantropus scamms, for excample Petter247 switched to a paywall)
So do not support fake artist.
So Don't advertise them, and if you do mention them, emphasize who they are, what they are connected to, and how much damage they have caused to the koikatsu community.
Seriously, there are plenty of better alternatives to spend money on, constructive ones, like Picasso, which at least ports hair asset that is not in the database. or at least petter247, as it has many constructive ports that we don't have in the database either. just things that are by definition progress. because investing in scammers is not progres, even not lethargy but regression.
Sorry for long comment, thanks if anyone read the whole thing.