I would disagree with that part. Forks are highly difficult. OpenBSD succeeded, so did the gcc fork that was sponsored by Cygwin but then merged back into mainline gcc. Otherwise?
Then, the council owns the entire marketing organization PSF, which owns the conferences, which means undesirables can and will be deplatformed.
It is much much harder to do a successful fork in 2024 than it was in 2005. Open source is corporate now, and the employees will stick with the official version and not the fork.
I think you could literally write an XPython fork that is 2 times faster, has a 100% compatibility but would still be marketed out of existence.
If Python had a free standard, it might be possible. But that will not happen.