There's a court precedent that pardons can be revoked if they were not delivered by the Department of Justice or not received by the pardoned.
Pardons aren't delivered by horseback anymore. It is electronic and instant. And the pardons can only be revoked by the issuing body. However Biden can still be impeached after he leaves office which would make his pardons void.
There is precedent for preemptive pardons.
The power of pardon conferred by the Constitution upon the President is unlimited except in cases of impeachment. It extends to every offence known to the law, and may be exercised at any time after its commission, either before legal proceedings are taken or during their pendency, or after conviction and judgment.
- Ex parte Garland, 71 U.S. 333 (1866) (law.cornell.edu)
Andrew Johnson pardoned Augustus Hill Garland (Ex parte Garland)
Ford gave Nixon a preemptive pardon over Watergate.
Carter blanket pardoned Vietnam draft dodgers
Thanks for the additional infos.
I've been reading up on this topic for a couple days. And from what I understand (((it doesn't matter what the law or precedent is. They will do what they want and write laws and acts or pay off judges to support it afterwards))).