Conservative groups influential with the Trump administration have pressed for the preemptive acts of clemency.
There’s a world of difference between a pardon issues to prevent malicious prosecution for non-crimew and one issued to people you’ve been instructing to commit crimes
A pardon was issued, there’s still an argument about how legal it may or may not be and the consensus is that it would not survive legal test.
You can’t pardon someone without them admitting a crime. There is no blanket pardon. The fact no one has tested it does not make it legal but simply untested.
It’s only ever been tried ex parte and they said only federal charges. Any state can try treason.