This is an odd bit of political trivia but enough of the states which Trump won his electoral votes from have laws forbidding Felons from taking office. If the democratic party just sues in those state, they could revoke enough electoral votes to prevent Trump from getting his second term.
It just requires them to enforce the laws that already exist. The only counter the Republicans have is to repeal the laws preventing felons from holding office. (Some of them started to realize this https://www.latintimes.com/republican-bill-inspired-trump-would-let-convicted-felons-run-public-office-missouri-568981)
From your link. I don’t have the laws of every state you’re referring to, but a state law preventing a convicted felon from holding a state office isn’t sufficient to prevent a candidate from receiving electoral votes. It would need to explicitly regulate federal elections to get a foot in the door, then at that point you’d likely end up in federal court to determine what restrictions you’re actually allowed to place on a federal election.