I'm with you on almost everything posted on this page, save the bolded.
For every person of interest from poor schlub to mildly famous all the way to household name, the standard for the feds isn't "convictable," it's "can't fucking miss." When you see shit cases like the Roger Clemens indictment, you know that the career prosecutors were overruled by politicians. I've been told this by several federal prosecutors and a couple of district judges (caveat on the judges: way back in law school before Obama broke people's brains).
Even at the state level, "convictable" is a subjective term.
Those things said, there could be pretty damning evidence in there. Evidence that might even convince a few Trumpers. But it wouldn't see the light of day under federal prosecutorial protocol if the case wasn't so airtight that no jury in any jurisdiction would find a former president, one of the most famous people in the world, and who has created a cult of personality so strong that he could actually shoot someone on 5th Avenue and not lose a vote, not guilty.