He fails to mention that he has AI also generate and do all of those tests, which means, A) he has no quality supervision over his quality supervision. Speaking from experience, AI can and will break a test in order to pass it rather than fixing the code if it randomly decides to. It is not always reliable and does not have even the baseline of good sense you would expect a brand new junior dev to have. And B) he's probably spending 3 times as much on tokens used for generating and running tests than he is already using on code generation. That's only going to be sustainable while these tokens remain cheap, which won't be for much longer, my guy.

Also it is always fun when someone asks you basic questions about your code and you have to admit complete and total ignorance because you neither wrote nor read a single line of it. How are you going to sell confidence in your black box that even you haven't peeked inside?