It will have to go through the courts. Once a case is filed it'll be up to the judge whether or not to issue a 'stay' of this regulation, which means it will not be allowed to go into effect until a decision is made. So it becomes rounds of file/stay/decision/appeal/stay/decision ad infinitum until it reaches SCOTUS.
If a stay is granted then the 'old rules' apply and the certification proceeds. What I don't know is what would happen if the election winner takes office and then SCOTUS decides that the election officials are allowed to refuse to certify 'on unspecified grounds' (ie if they don't like the winner). Would the sitting POTUS be removed or would they stay in office under a 'grandfather clause'? Who knows. Once again, we are in uncharted territory.
We've seen this tactic used time and again by Trump to delay his various trials. Hopefully this time we can use it against him. Because this is in no way going to be decided before the election, assuming we get on the 'appeals-go-round'.
I agree, this needs to be screamed from the high Heavens, but it's the Dem Cmtee officials that are the ones that need to be doing the shouting for anything to happen. The only thing I can think of is maybe they're thinking 'two can play at that game' hoping to install some Dem-leaning officials in various elections offices, too. It's not like us to ' when they go low when we go low, too', but if needs must.....