This is not correct, throttle safety switches are designed to kill spark, even though a faulty one may have caused you a limited rpm problem this is not the function of the switch, they are one of the reason sleds started to eliminate tethers, if there is no input force on the throttle lever but the throttle cables drawn out the throttle safety switch will not be engaged witch is integral in the loop for spark. On another note tethers are also problematic.
After a roll over or wipe out I often give my throttle lever a couple good smacks to make sure there’s no snow in there to mess up the function of the switch, I have pulled on my sled 8-10 times with no starting then smacked my throttle two three times sharply then started the sled 1-2 pulls after, more then once. And have had sleds not start at all until the throttle safety switch is disconnected.