You don't say what car it is. The LH2.4 will absolutely load compensate during idle. You can drive the car without touching the accelerator if you engage the clutch slowly enough.
The load compensation baggy is talking about is immediate signaling. The auto drive and AC put on huge loads which might otherwise stall the engine, so they are signalled directly to the ECU and it immediately changes the fueling and idle valve setting. For the rest of the loads the ECU uses the rpm feedback from the ignition ECU and this provides a slow feedback.
Either your idle solenoid is stuck or your idle switch isn't working and the ECU doesn't know it is idle mode.
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