If true, this doesn't account for the other courses where fraud has been committed and money did exchange hands. I had no code, I paid real money for something. Maybe it was a v similar course; I've not been near my login password to verify this is the exact course I joined (was last winter), but I have a good memory for titles. I could be wrong and joined a different course, but I suspect Udemy might be lying about that, since the course was open to other registration!
When I get to the right machine, I'll have a look and come back to you. I'm certainly fallible. Yet... There are the other courses to consider in any case