Comment by layer8

You wrote: “If they hand wrote the code we know they at least looked at it once.”

But that’s not true, because even if they did indeed hand-write the code, we as third parties wouldn’t have any reliable proof of that, and therefore still couldn’t draw the conclusion that they looked at the code.

Them claiming to have hand-written the code isn’t any better than them claiming to have thoroughly reviewed the code. We can’t know in either case.