You’re assuming GP read a fake news article saying Peterson was banned. Much more charitable, and a safer assumption, is that this was a misunderstanding by the OP.

Jordan Peterson was the one who, by boycotting Patreon in response to their behavior, created the association which led to this misunderstanding. He tied his leaving to this event directly.

I seems to me that Peterson no longer felt safe putting his revenue stream in the hands of Patreon, because of what he saw as unfair and improper political bias which could one day disrupt his own finances.

That to me is a lot more worrisome than someone being wrong on the Internet.