What the parent post was saying is that anyone can print out a piece of paper with your mail address on it, complain on twitter, and ProtonMail's feeling-based policy will have you banned.
We're now 5+ posts down the tree and people still aren't getting the post, probably the reason it was flagged and silenced.
Currently a human is making the judgement call to ban someone, based on their feelings. They could very well be looking at misinformation, but have no way of verifying.
The address banned could be completely unrelated to this hate group, maybe the hate group doesn't even exist, this is the point the poster was making. You easily can misinform, and get someone behind a protonmail address banned.