If you know how to use google and realise that only certain serial numbers are hackable(based on your original post)from the switch model, why do you think nintendo would would start reproducing hardware with a security flaw again....... Really. I am in two minds wether or not this is a troll post, because it just such an unintelligent question.
Highly unlikely for any newer switch iterations to come with the previous bootrom bug unpatched. It would be a dream within a dream for them to include said bug.
Anyways, regardless of what you're buying be sure to check its serial number with this tool even if you were sure and confirmed that it may be a non patched unit, you should confirm it through that website.