Orban has been doing his "illiberal democracy" (i.e. not a democracy) thing for 15+ years now. The EU is about as laughably powerless to stop him as I am to stop a punch by Floyd Mayweather. So it's kinda funny you say that.
He does some bad things but he would not get away with anything as extreme overturning an election based on a pretext like this, nor with widespread voter fraud. Eventually he will lose an election, just like Law and Justice in Poland. Judging by the polling trends that could be as soon as 2026:
https://en.wikipedia.org/wiki/Opinion_polling_for_the_2026_H...