False. Emergency Standards like this one are frequently slapped down by Courts.
It doesn’t mater that it is regulatory since it a question of who has authority in this field. Historically this has always been a State power. Bare Shelves Biden is trying to claim it is within the Feds power
I REALLY hope you are right. But going the OSHA route was very smart. Courts are very cautious about stepping into regulatory matters (if I remember right you are connected to law so your view is probably closer to the situation).
But from years of dealing with OSHA, and having our compliance folks say “There is no appeal”, I am pessimistic it will be able to be stopped.