remember that anything he does isn't automatically given qualified immunity, it just means it has to be an"official act". what's an official act? they didn't say, which means that will get litigated all the way back up to the (conservative) Supreme Court. Biden isn't as able to take action as Trump.
that doesn't mean he shouldn't do it tho. if he did the below, he might get convicted in like 4 years of a crime but he'll be dead by then and once the Supreme Court sets precedent that you can't actually arrest your political opponents, Trump wouldn't be able to do it.