In a Demon Torque Reserve only works in Launch Control and when the Trans Brake is being used. It's automatically enabled during these times.
I never tried Launch Control in my Frostbite 2020 RedEye.
I have never tried it in my Super Stock either, yet. But one of the comments above says when he power brakes it he gets Torque Reserve. Not sure if he means power brakes it, as long as LC is enabled. But that is not what I consider a power brake. You are whacking the throttle wide open. So this makes no sense.
Both the RedEye and the 2020 Super Stock do not have Torque Reserve during a normal power brake when not using launch control.
And to the OP. At first FCA tried to discourage us using Launch Control on the Drag Strip. But eventually I got them to admit that we should be able to use it on the Drag Strip. My experience is you better have the hook if you are going to try and use it. And it has the potential to be ever so slightly quicker than a foot brake.
@CPO Super stock