Apparently it isn't a thing after all, I asked Sondors directly about the Rockstar, here is their response.....
"There is no Turbo feature it is just a much more powerful mid drive motor (Almost double the torque of the Fold XS)"
This makes me think that Storm was basically referring to the throttle on this Ebike when in the highest PAS level, the throttle is like a turbo from his perspective on this Ebike.
Which is interesting because his other Ebikes have throttles as well, and Sondors has confirmed to me they are all tuned exactly the same as well.