A couple thoughts:
*I think it's fool hearty to focus training on the development of a fiber type. I think there are plenty of benefits from training / converting the fibers that don't naturally have the properties you want (ST and FT IIb fibers) to function more like you want them to (depending slightly on the event).
*Squat depth has many more training implications than just fiber type emphasis. For example, muscle activations change at different depths. For example, in a high bar squat, glute and hamstring activation is greater as the squat gets deeper. The hamstrings and glutes are the biggest motors in the sprinting machine…why would we want to avoid them.
*The metabolic affect of deeper squats would be expected to be greater than half squats because the work time / time under tension is greater and the overall muscular workload would also be greater due to the reason mentioned in the previous point.
*DEEP squats are one of the best ways to increase hip and ankle mobility in a very functional manner.
Without reading the study, those are just a couple things I'd mention. Do you have the abstract or study details.
with that said what types of sets/reps do u use when implementing full squats for a sprinter?