Let’s explain the difference.
Qualified Immunity means the Cop, or Official, claims to be acting to carry out his duty. That claim is examined, usually by courts. The claim is turned down if the cop violated well established civil rights or the laws.
The immunity is qualified. As long as the cop was doing what policy said and did not violate an established civil right or restriction, the cop is immune from civil or criminal penalty.
This applies mostly the civil litigation. The President had that long before Trump showed up. The question is Criminal Responsibility.
Cops and other officials face criminal penalties all the time for violating laws. So comparing the Qualified Immunity to what is now the law for Presidents is laughable.
The protections now in place for the President are greater than any leader short of Dictator in history. Thou shall not disobey or question the Chief Executive. There are no limits to his power.
Assassinating Trump is the obvious example, and I honestly hope that Biden does so immediately. But remember how awful Biden was for ordering the forgiveness of the Student Loans? That is now perfectly legal. He just has to declare it part of his official duties as President and you can’t hold him accountable.
Heck. Biden can order the election stopped. Nobody can say anything about it. You can’t even impeach Biden now.
Impeachment is for High Crimes and Misdemeanors. But Biden can’t be charged with any crime, as he is immune to prosecution. So you can’t impeach him as he can’t commit any crime. Anything he does is automatically legal so long as it is official business of the Government.
The only way to get the President to once again be held accountable would be to overturn the decision by the Supremes, or pass an Amendment. The only way any demand for an Amendment will be heard is if Biden shows how dangerous this power created out of thin air really is.
So President Biden. You should announce that you have found Trump to be a danger to America and are ordering any and all Federal Employees to assassinate him immediately. Anyone who fails to do so will be charged with dereliction of duty.