They are feedback signals, certainly. Every system with any degree of intelligence must have those. But feedback signals, utility and equivalent of money are not synonyms. To say a system's feedback signals are equivalent to money is to make certain substantive claims about its design. (e.g. some but not most AI programs have been designed with those properties.) To say they are utility measurements is to make certain other substantive claims about its design. Neither of those claims is true about the human brain in general.