What Robin is saying is, there's a difference between

• "metrics that correlate well enough with what you really want that you can make them the subject of contracts with other human beings", and

• "metrics that correlate well enough with what you really want that you can make them the subject of a transhuman intelligence's goals".

There are creative avenues of fulfilling the letter without fulfilling the spirit that would never occur to you but would almost certainly occur to a superintelligence, not because xe is malicious, but because they're the optimal way to achieve the explicit goal set for xer. Your optimism, your belief that you can easily specify a goal (in computer code, not even English words) which admits of no undesirable creative shortcuts, is grossly misplaced once you bring smarter-than-human agents into the discussion. You cannot patch this problem; it has to be rigorously solved, or your AI wrecks the world.