The Throttle Position Sensor (the infamous TPS) usually only affects tip-in throttle response. I've run Toyotas with the TPS disconnected and the engine still ran reasonably well. I'm not sure how dependent Honda's PGM is on TPS input, but most EFI systems I have seen use it for fine tuning tip in response. Still, I have big issues with devices intended to fool the ECM into thinking some sensor is detecting something different than the actual operating value.
Years ago some of the really primitive methods used to richen mixtures involved sending corrupt coolant temperature sensor data to the ECM. Usually they'd have some variable resistor fixing the value coming from the coolant sensor to make the ECM think the engine was in constant cold cycle. It only sort of worked....this looks to be something in the same vein.
