Here is the "usual" process to make a rule change like this:

https://www.federalregister.gov/uploads/2011/01/the_rulemaking_process.pdf

Also take a look at the Administrative Procedures Act,

https://www.archives.gov/federal-register/laws/administrative-procedure

Note that it is normally a lengthy process. Of course, that won't matter because they are twisting/bending/breaking anything that gets in the way of their dictatorship.

Don't worry, people will be able to petition OSHA to amend or repeal any rules and they'll be able to file an appeal with the DC Circuit if that fails :^)