The theory is that the Supreme Court gave him immunity. That shields him, allegedly, for anything he does while President. That does not shield any of his cabinet or staff.
Just remember, he who is in charge makes the rules. So if when Democrats are in charge again, they will reverse that ruling.
Just remember, all 3 branches of the Government are in this together. The Heritage Foundation has spent 40 years placing judges on benches all over the country, including the SC.
They are all corrupt and no matter how we get out of this, everything will change. Many people no longer trust the Government (both sides), Law Enforcement, nor the SC, so we cant go back to SOP.