The question was about limits of Presidential Immunity. Is there a limit as to what the President can do? Any crimes that are beyond the threshold for immunity.
If the answer is yes, then we need to go down the list of crimes and decide which are, and are not, subject to immunity.
In other words, which crimes would be prosecuted if a President committed them.
If the answer is no, there is no limit. Then even murder of political opponents is legal.
Trumps attorney argued while Trump was sitting right there that there was no limit. He argued that there could be no prosecution unless the President was impeached and removed from office.
I personally hope the Court finds this heretofore unimaginable immunity does exist. Then Biden can, using the Trump ruling, just have Trump killed and be done with him once and for all.