I can attest with the utmost confidence that every developer or manager or whoever that claims "all code written by AI is reviewed by a human" is a boldfaced lie.
AT BEST they have quickly skimmed it, but more likely they've not looked at it at all.
Actually reading code THAT YOU DID NOT WRITE YOURSELF takes quite a bit of time, and the one thing that people who use AI tooling care most about is just how fast it makes things.
They will not spend the time needed to actually read it.
Any developer worth their salt will know that bugs in code arent typically obvious, and the severity of a programming mistake has literally no association with how much code relates to it.
Single-character bugs can be disasters.
You cannot reliably catch a single character being incorrect when glancing through code, especially code you didn't write, ESPECIALLY code you're unfamiliar with.