I’m not saying he was necessarily right in his opinions and conclusions, but it was both a close and highly unusual election from a procedural perspective due to Covid related voting procedures.
The link you provided is an indictment, not a finding of fact. I suspect that the “knowingly” portion of many of these charges will be difficult to prove.
There are many reasons to oppose Trump, but this hyperbole about thwarting Democracy is not persuasive to about half the country.