You're mistaken, Codeberg isn't ran by some guy, it is a non-profit organization with ~1200 members (not to be confused with users - there are ~200k users), ~780 members of which have voting rights.
He's not mistaken in any substantive way: it's still not a public square and those ~780 members have every right to make rules that offer a great deal of discretion to those doing the enforcing, and such discretion is entirely consistent with their other rules.