I don't believe that's correct. MacOS has been a certified UNIX for ages, but to my knowledge Apple have never claimed nor sought to have their "smaller" operat

I don't believe that's correct. MacOS has been a certified UNIX for ages, but to my knowledge Apple have never claimed nor sought to have their "smaller" operating systems certified as UNIX. https://www.opengroup.org/openbrand/register/ https://www.opengroup.org/openbrand/register/