In the spec sheet for the 2021 RTs (RT, RTL, S2S) in the section on "Safety and Security" it mentions Hill Hold Control. I cannot find anything about it in the owner's manual, two dealerships did not know anything about it, nor did one of the representatives at the RT On-Road Experience I attended. Can anyone provide any information on this illusive feature?

Does it exist on the 2021 RTs as stated in the spec sheet?
If so, how is it manually engaged and disengaged?
If it's something that happens automatically then under what conditions does it engage and disengage (maybe some sensor exceeding a pre-determined slope or angle of the Spyder)?