So you are saying that there is no way Trump can be sworn into office this year or any time before January 2025? Because if he is then he is the actual winner of the 2020 election and that's his second time. Can't run again in 2024.
Being appointed as Acting President would not be an election, so it wouldn't count towards his allotment of two. It would count as years, though, but would still fall within the allotment of 10.
However, I don't believe (though I've argued for it) that Congress or SCOTUS would accept a retroactive invocation of the 20th amendment, even if it took two years to discover and prove the fraud, meaning in hindsight that the President-Elect had failed to qualify and covered it up.
-PJ