Non-issue. As a general rule, state and local LE are not capable of enforcing Federal law in and of itself. That's why, for example, special legislation or other grants of authority are needed to have state/local cops enforce the Motor Carrier rules, Immigration stuff, and a ton of other things. SImilarly, Feds cannot on their own enforce state law, municipal ordinances and the like without specific authorization.
I also note that NO citation is made to any proposed federal legislation by bill # - a sign that this is not actually in progress. As for the states that are looking at letting feds enforce some state laws, proposals for which citations appear to have been given - they may have their own reasons.
This is almost certainly 100% tin foil hat.