Hope other states’ OSHAs follow suit.
A lot of states have their own OSHAs.
They are allowed to by the feds. The allowance is conditional. One of the conditions is that the state OSHA have all the fed rules or more.
This talk by Iowa OSHA is bluster, and will have a very short life in federal court, should SCOTUS decide OSHA has the power that OSHA claims to have.
Article VI of the US constitution, US government is superior to the states. All it takes is for the feds to assert their superiority via the federal court system, and it's a done deal. No state has ever successfully resisted any federal rule that was endorsed by the federal courts.
I did not know that, that's very good news.