Steve Jobs was not an UX Designer, he had good taste and used to back good design and talent when he found them.
I don't know what Sam Altman is like outside the what media is saying, but he can be like Steve Jobs very easily.
I think you are equating coding with 'design'. Just because Jobs didn't code up the UX, doesn't mean he wasn't 'designing' when he told the coders what would look better.
Also, having a good taste indicates that the person who has that, is not a creator herself, once something is created then only the person can evaluate whether it is good or bad. Equivalent of movie critics or art curator etc.
https://www.businessinsider.com/macintosh-calculator-2011-10
So very easily Sam Altman can be an AI Engineer the same way Steve Jobs was a 'UX designer'.
You can be an interior designer without knowing how to make furniture.
You can also be an excellent craftsman and make really nice furniture, and have no idea where it would go.
So sure, UX coders, could make really nice buttons.
But if you have UX coders all going in different directions, and buttons, text boxes, etc.. are all different, then it is bad design, jarring, even if each one is nice.
Then the designer is one that can give the direction, but not know how to code each piece.