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Just checked the truck with the AE and popped up with P0471 exhaust pressure sensor range performance, and P0476 exhaust pressure control valve range performance.
dont know if it was because the truck was so cold and I just started to hammer on it cause I was late for work or what. I cleared the codes and restarted the truck rev'd it up and nothing came back on. Is this a warning "jackass i'm cold" light or what. Morning was a cool 10 degrees. Thought I plugged in my block heater.
IIRC, the general guideline for using AE is with the engine warmed up to operating temperature. That said, sounds to me like you reached the correct conclusion.