Unless he plans to imbed some custom file that he is then going to keep a database on to cross-reference every download with every sub, then it seems all the one that wants to upload it to pirate sites would need to do is unzip/rezip, and you've just changed its digital fingerprint.
And even if he *did* imbed some custom thing to track it, what's to stop them from just making a new Patreon account?
Either way, sounds like a lot of talk and empty promises, to which like everything else from this dude, believe if when we see it.