As I've said before, he has limited power to say 'no' to a drilling permit once a lease is issued. So what he has done is sharply reduce the issuance of new leases:
That's a very big deal, even if it isn't anywhere near enough.
Actually fixing the problem means:
- Having a majority in the House
- Having support in the Senate to overcome a filibuster and change the law (60% supermajority)
- Having courts willing to go along with breaking something they've previously deemed a 'property right'
That requires power that neither Biden nor the climate movement has yet held.
He was able to cancel those ones because they were issued without proper environmental review and because they'd only just been issued. Even so, actually making the cancelation stick required winning a subsequent lawsuit.
Most other cases aren't ones where lease cancelation would win in court.