Trump is invariably within the margin of error. Add a bit of election interference, a third candidate to siphon votes, some gerry mandering, a bit of help from a partisan supreme court, ...
If you regurgitate that rhetoric it’s more likely to happen.
I have a related degree.
An important way republicans will try to win the election for Trump, is to target democratic voters with propaganda which suggests that Biden is certain to win or that he's more right wing than he actually is, thereby lowering democratic turnout.
They know they won't convince young voters to vote conservative, they know they won't win majority support, so they'll try to convince progressive to not bother voting at all.