you are a hairsbreadth of being over a d’oraisa …you press down on the towel a little bit too hard and you are over schita
that is completely untrue
there is no problem whatsoever of sckita with drying your hair with a towel since you are squeezing liquid from a solid into a solid. it is the same exact concept as squeezing a lemon into solid food.
the problem only arises if you squeeze your hair onto the floor. and then it is not d’Oraisa, because you dont want the water.