A related blogpost from the .org: https://wordpress.org/news/2025/04/jubilee/ Jubilee is probably a reference to the Old Testament concept of a Year of Jubilee where all debts are forgiven and everything is returned to their ancestral owners.
But this also sounds like a classic Mullenweg oscillation/overreaction at this point - instead of unbanning just the people whom he banned in pettiness, he would rather make a massive ordeal of it.