Let's be real honest here. If Biden did cheat to win this election, it would be SO MUCH MORE impressive than just winning, as all polls had predicted. Trump didn't even have the popular vote in 2017 so why would he have it now.
Imagine ALL the logistics it would require, ALL the people to bribe and make sure they stay silent. Including a ton of republicans. That would be an INSANE feat. It would actually be a sign of ultra competence.
The truth is he's probably just moderate enough not to scare sane republicans and centrists, and the left learned their lesson in 2016 when they didn't vote for Hillary because reasons.
Also, without Covid, I think Trump would probably have won, as crazy as it sounds from where I stand. I know Italy should probably not try to give too many lessons, we had our fair share of crazies too (Berlusconi lol).
Anyway, Trump himself sums it best.