If there's anything like that in his will that the new owner can't move the team, I can't imagine it actually being legally enforceable. You can't dictate what somebody does with something if you don't own it anymore. It'd essentially be a pinky promise.
Moving would be incredibly difficult and unlikely to be approved by the league though.
This is not a true statement AND we’ve had the discussion before.
Anything can be sold with stipulations attached, all that’s required is an agreement via contract.