It's not at all obvious that "they" refers to "netflix and other post-production oriented users", and your argument is a tautology "Python is good at the things that Python is good at". Obviously. The rest of us are debating what those things are or are not.
The subject is well-trodden, there's not much to debate. Python is not good at threading, but works well in multiprocessing situations. Netflix is using it in the later situation, and not the former. Async is unlikely to be a use case either.