Since Iceman didn't elaborate on what actually allows thok to be useable in platforming, I will:
Same strategy applies as with normal jumping, except now you have a fixed starting speed. Before you can use it for anything, you have to become familiar with that speed, and how quickly you can slow down from it so you can predict what is safe and what isn't before you're in the air. Generally speaking though, if you use thok to speed up for platforming, you are always holding brake as you do it, because sticking a landing at 60 FU/T is goddamn impossible and if you need that speed to clear a large gap, you're more likely to be spinjumping and thokking in mid-air when you want control back so you can move forward at high speed while ascending, anyways... and when you want control back, it's usually because you want to start braking, so you're still holding brake as you thok even then.
But again, that's built upon very intimate familiarity with thok's exact speed, because you don't have any time to gauge how fast you are going once you use it before adjustments are required to not die. If you have to check your distance over time to project where that thok will take you during a precise jump, it's already too late to fix it.