The Supreme Court refused to prosecute Trump (for a blatantly illegal act) and ruled that he was immune to prosecution for “official acts” which they refused to define.

That’s what I said.

Then they slow walked the case back to a lower court - deliberately - so the determination was not made until after the election.

That’s not what delayed the case. The special prosecutor had to redefine the charges, in order to comply with the latest ruling, by specifying which ones were not included in Trump’s “official duties as president”. They were allowed to prosecute him for those…but inevitably ran out of time before they could proceed.

*Then in a state court, Trump was convicted, but the judge delared there was no penalty “because only a federal court could apply punishment”.

Then a couple of days later the DoJ dopped the case because “the president is immune from prosecution”.*

That’s because the election happened, and it is long-standing precedent that a sitting president can’t be prosecuted…as long as he’s in office. They can and most likely still will, return that case to court, as soon as he’s out of office.