I can only assume they mean "ok" in the sense of "the large fraction of less-sophisticated engineers who only want to think about the happy paths in their code.

I can only assume they mean "ok" in the sense of "the large fraction of less-sophisticated engineers who only want to think about the happy paths in their code." Github's co-pilot is a poor code generator, but it's a fair example of how bad a lot of public code is. I'm not sure private code tends to be much better in many orgs.