Reading it I'm not sure if this is just a unilateral communist-style purge or an actual fork launch (or both). Here's hoping the fork gets off the ground and removes most of the pressure creating this nastiness that isn't helping anyone.
Just pointing out with gpl forks, if egos will allow it, code can be shared both ways. That's much easier if bridges are still standing.
None of the banned people mentioned a fork, some don't even have anything to do with wordpress other than commenting about the drama on twitter. The whole post is matt gaslighting to justify the purge.