My jaw hit the table when I read that. Just checking here but, are you being serious?

I absolutely believe this and follow what I said to an extent. You don't need to triple check every line of code and deeply understand what it has done - just the highlevel design.

I usually skim through the code (spot some issues like are they using modern version of language?), check the high level design like which interfaces and do manual testing. That is more than enough.