I think that efforts that Trump made to ensure that the election was fair and legal could be said to be official in nature, despite some personal stake in the issue. He has to protect the nation and thus if he has a question about cheating...then as president he must pursue it!
That will be the question...did Trump have the right to question the election results as part of his job to protect election integrity vs the presumption that he was trying to overturn the election. I think if the Trump team plays to that question in court, then the Prosecutors have no case. They can’t prove that Trump did not have that right to question the results officially as president.
No court would grant any real hearings on the issues of possible cheating so thus Trump was stymied.
The simple fact is that EVERY President is not merely the Chief Executive, he is also a politician. As such, almost every action (or inaction) can be characterized as being political, and thus personal…but the reality is that most actions are a mixture of the two. This is why the Court said “presumptively immune” for all official acts that aren’t strictly provided for in the Constitution. This, being as objective as I can be, is not a very wise decision - NO President can hope to function if he’s always worried about being prosecuted for every decision he makes.