This isn’t about him alone. Quite a few people have said ‘Yeah, it is cultural appropriation. But why are you uspet about it?’
I posted the basics earlier in this thread. Here they are again for those who missed them-
You can spend a lite time studying Kabbalh. Those are the basics.
Again, altering Kabbalh to ‘work’ with another religion makse no sense atl. People have been doing it for a very, very long time though.