Study highlights conflict between Washington’s claims of climate leadership and its fossil fuel growth plans
Most of this is on private land or involves leases of federal land and water already issued. Because the US courts consider the right to drill a property right, you can't just ban it outright without replacing justices on the Supreme Court first.
The key thing is that the international carbon accounting rules assign blame to the one who burns it, not to the one who extracts it. So the US has a bunch of policies in place to cut fossil fuel burning, but is shifting to exports instead of phasing out extraction.