The Travelin Man
Actually, I think he is right. He may not have said it in the most friendly way or explained fully, but what most people sell and order as "prime rib" is likely not. It was explained to me that what is cooked at most places is a "standing rib roast", probably with the bone in. When it is served (or placed on a menu), it is then called "prime rib", but true prime rib should be of prime beef.
My mom used to make standing rib roast for major holidays and made a point of calling it such.
I am not now, nor have I ever been in the food business, but I am pretty sure that this is correct.
FWIW, I don’t much care for the restaurant prepared cut. My mom’s was pretty good, but definitely a different flavor, and tenderness.