The further you go down the rabbit hole of people sneaking around with fake ballots and stuffing boxes, the less likely it seems. That's why he calls it the "low IQ stop the steal" ideas. If you have really thought through the details of what it would take to pull that off, you know that would be nearly impossible. Dinesh D'Souza really, really tried to come up with a plausible theory on how something like that could be possible. In my opinion he failed, but then even the signals he was using as evidence were later shown to be such a load of bullshit that he had to admit it publicly. The "high IQ stop the steal" idea was that the election was stolen because the media was on Biden's side, bought into the Russia-Gate lies, covered up the Hunter Biden Laptop, etc. This stuff is at least true but it's hard to say whether it actually swung the election or not.
Trump, being smarter than D'Souza AND the "high IQ stop the steal" crowd knew that it didn't matter if it was true or not, because as long as he said it was true, MAGA would do whatever it takes to convince themselves it's true because they are really just in love with Trump and when Trump departs from ideology or truth, ideology and truth lose.