I have a scrap wheel with the painted type finish that I have experimented with. After stripping a section, you can clearly see the machine marks that you mention.

If it were stripped chemically with no scraping or rubbing, I expect that the machine marks could be merely cleaned and coated, but I'm not sure.

If the wheel refinishing companies chemically strip, I am curious if they do this in a vat that uses no scraping or whatever.

Have a great day,