Trump should have formally conceded in 2020 and handed over to Biden at the WH, as is tradition. I think that was his biggest error.
But conceding does not necessarily mean the same as agreeing. Several red flags flew before, during and after the 2020 election but no serious investigations of same came about - rather the opposite.
We'll have to see what evidence from 2020 might have survived, if any, because a lot of it seemed to disappear, almost as soon as it was heard at the various state hearings. A bit like those disappearing J6 "Select Committee" hearing records!