Just a guess but OSHA probably isn't more involved because they're looking at how the NRA has, for example, carpet bombed the Surgeon General nomination because

Just a guess but OSHA probably isn't more involved because they're looking at how the NRA has, for example, carpet bombed the Surgeon General nomination because the candidate had the temerity to suggest that gun violence could be addressed as a public health issue. OSHA leadership probably just said "fuck it...if gun owners want to poison themselves, have at, but we're not going to put ourselves in that crosshair".