In my opinion, this is too much.
Norman is for sure one of the most known/important designers focused on UX topics, but I would not say that the entire UX industry is built according to his view. There are several names of designers popping up to my mind that have a heavyweight in the design environment.
Regarding your question, as far as I know, he designed stuff for Apple and HP. I don’t have any details about his production as a designer. I don’t think this is important to evaluate the importance of his activity in the design environment.
Keep us posted on your research, it sounds interesting!