In that thread, Vidal states that a resistor is not needed as there was a panel firmware update?
He confirms it is required. The above post is good info to follow. Here is the post from Vidail linked below:
I bought the PG9979 which is the new heat sensor only. It programmed it into the IQ4. I used the auto learn. It captures the secondary ID. I states its a smoke detector even though its a heat detector. It populated group 26 heat/smoke. Is this OK?
Yes, sensor group 26 is the group you want to use, that is the fire detection sensor group used for smoke detectors and heat detectors, that’s normal.
Do I select sensor group 26 for the Power G sensor?
Yes, the PG9945 would be sensor group 26 for fire detection.