Let me demonstrate how lame the election deniers are:
Before the election in 2020, GOP politicians change the rules so mail in ballots cannot be counted until after the polls close.
Massive amounts of voters use mail in ballots in 2020 because of COVID.
At the close of voting, the first ballots counted come from precincts reporting in person voting, which is largely Republican. In the middle of the night, the mail in ballots are counted, and these are largely Democratic and greatly impact the early GOP lead.
Low information types see this as voter fraud, not understanding that it's an outcome of the GOP decision not to count mail in ballots before close of voting.