No I'm sure it was them, though I'm not surprised to see others pulling this crap.
This whole 'I'm not doxxing you I'm just attaching your private information to my product and releasing it online teehee' won't hold up anywhere, just like those dumb 'I don't consent to facebook using my data' posts, those terms don't mean anything when you sell shit you don't own.
There's no court, lawyer, or even online platform who'll see the content they make and sell and think 'yeah, we should side and defend them'. Patreon, fanbox, gumroad and others are already a pain in the ass to deal with, when the shit gets going they're not going to have their backs.
It's a very stupid and dangerous game they play. Even worse If one of the leakers they doxx turns out to be a schizo with more money than common sense (which you need to buy these 300-500 usd cards). Paywallers aren't the only ones who can hire people to dig out info and fuck up someone's life, so what they're doing here is beyond retarded.