And notably, before any further disagreement pops up the other dissenting judges literally said as much. The relevant quote:

"When he uses his official powers in any way, under the majority’s reasoning, he now will be insulated from criminal prosecution. Orders the Navy’s Seal Team 6 to assassinate a political rival? Immune. Organizes a military coup to hold onto power? Immune. Takes a bribe in exchange for a pardon? Immune. Immune, immune, immune. Let the President violate the law, let him exploit the trappings of his office for personal gain, let him use his official power for evil ends. Because if he knew that he may one day face liability for breaking the law, he might not be as bold and fearless as we would like him to be. That is the majority’s message today."

> The ruling was that he had full immunity during "presidential duties"

Yes. This was basically agreed upon before that the president has legal immunity for exercising his constitutional powers, but was never explicitly ruled on by the court. If the president does something outside his legal authority, then that isn't his presidential duty, and he can be punished.

> which has many times been interpreted by the SC as "anything he wants to do while president."

This part is just false