Wasn’t the limit on regenerations imposed by the Time Lords themselves? If they’re not around to enforce it, and the Doctor is a “renegade” to begin with…
Unless you’re reading the EU and before the retcons, the regeneration limit is a biological function of a Time Lord. It wasn’t imposed by them it’s just in their biology.
The Time Lord’s not being around and the Doctor being a renegade means the rules of spacetime don’t apply to the universe meaning spacetime is in a flux where anything can change.