Spitballing here, but I think this take has credibility.

I think the Dems planned to cheat, but I don't think all the efforts were coordinated. I think you had individual blue-haired Xims and Xers harvest/destroy/lose/create/chuck ballots, state level partisans having mail-in ballots created in response to Trump's vote tallies in the 11th hour (and in a panic, did not select any down-ballot votes in some states), and the big deep state flipping votes via the machines based on their targeted percentage or whatever algorithm they used. If the Biden campaign was in on any of them, it was likely that one.

I think the huge turnout for Trump actually caused these independent sources of fraud to panic and start overshooting each other, which made the fraud obscenely obvious. Normally when these three independent groups cheat, they do so on a much smaller scale which makes it that much harder to detect.