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that has been the general advice but no one can tell me exactly why that is.
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That is because on a dyno there are controlled conditions under which the car can be tuned. Can't be said much clearer than that.
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he seems to believe since the car was designed to run on 87 and all the sensors are still being used (like i said above i was able to run in closed loop) the computer will adjust to use any type of fuel (87-96) u put in
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Ask him how he knows for sure that it will not start to detonate at 87. If it doesn't, great, you don't need 91. If it does, for long enough, you'll be buying a motor. Ask him if he'll cover that cost if he's wrong.