I'll play devil's advocate. I haven't seen evidence they love watching monkey torture for enjoyment but perhaps stumbled upon it and found inspiration in drawing macaques. Several of their posts mentions donating to monkey charities and exposing the abuse done to macaques and apes.
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I looked around a little and I think I know what's going on.
In my opinion, this guy is innocent. He appears to be an artist from the Netherlands (Sidney Tuttel van Dorst) who generally draws macabre stuff, but also random nature/animal subjects. Here are some of his links:
登录 Facebook,与好友、家人和认识的人分享和建立联系。
www.facebook.com
If you appreciate my art and want to support my efforts, you can buy me a coffee. 🙂
www.buymeacoffee.com
In none of his uploads (that I looked at) did he mention anything BMT-related or used any of their regular lingo ("million pity" etc).
In the pics
@Snack of Midday posted, it looks like the zoosadist KarenMafia just uploaded the artist's drawings, but it doesn't look like the artist himself is in any way involved with it.
As for what
@RadioactiveMonkeyMan posted, the profile on that bestiality site belongs to one "NocturnalAllure," but the artist's nickname is actually "NocturnalLure."
What's tricky is that both users are from the Netherlands, which would make you think they are the same person.
But look at this. If you search for "NocturnalAllure" on zootube, you get this result:
Yet, if you actually click on the profile, you get this:

Totally different details. Weird.
I looked at a few other profiles, and would you look at that! They all have the exact same details. For example:

So it looks like that site just replaces every user's details on their profile with these exact ones, for some reason.
It looks like "NocturnalAllure" and "NocturnalLure" are indeed just different people.
My opinion: just a coincidence. The artist guy looks innocent.
Edit:
probably just a coincidence. Not too sure just yet. Need to do a bit more digging.