Yep, EO's are still subjected to judicial reviews.
This ruling doesn't let Biden write new laws. But, he could put out an EO and then use force to enforce it. He could put one out, that then gets overruled, then he could just claim that the justice department was wrong.
A brilliant kind of stupidity, though. They know this won't hold up, they're just trying to buy time so Trump doesn't spend part of his campaign behind bars.
Even if he were prosecuted, his lawyers could claim he was too senile to know what he was doing, and it's not like he's got enough years left in him to worry about seeing the end of it.