Ahh I see. They could chose a different hechsher. Sorry, I misunderstood the first time.
I’m not including mixing meat with dairy equipment as an “accidental transgression.” I believe that when the OU talks about the risk of people doing that, they are speaking of people who willingly make the choice. Only using OUD could cause accidental transgression for the reasons mentioned now by several of us on this thread. I don’t really feel like repeating.