What is important with these "trump won't be allowed to vote" parts coming from other states, is the fact that do they have a legal standing or not. If they do have a legal standing it's very scary, if they do not have any legal standing that is even scarier as well.
Think of it this way, if they do have a legal standing, that means a president of the USA did something so horrible that legally he is not allowed to run again and it is real, not fake at all. If it is not legal, then it means there are some judges in the USA, who has used their power to illegally not allowed a president to run, which could be precedent and other states may start doing it too, if they are allowed to do that, then how could we sure that some republican state judge won't do it to Biden? So it is not really any good way at all, in either case this is quite scary, either a president did something that prevents him to run again, or a judge used their power for unjust move, that is terrible to think about.
The things is that there are some politicians in the United States who believe the article in the constitution which is being used against Trump is supposed to be used specifically in this way and in situations like these ones for preventing bad people to reach the presidency or any official position within the government whatsoever, while there are other who believe this is an article which is specifically about the prevention of people who participated in the American civil war into the Union politics.
Regardless of what happens, the judges of those states won't have the final word, the SCOTUS will and they are likely to side with Trump anyways.
Whatever happens (and going beyong gambling and betting on political options for the presidency of the United States) this year sure is going to be pretty agitated in the news, rumors, conspiracy theories and probably foreign intervention on the way of thinking of the public. It has already been proven that Trump only gets stronger with each accusation and these attempts to kick Jim out the ballot will continue to accumulate support for him. Let us see how the primaries go.