That's cool. You dont want any part of the enclosure to be over 94 or 95 tops.
If he wants to get even warmer than the 90, he'll burrow under the paper towels towards the heat.
But if under the towels is 98 degrees, he's in for some trouble
My cages are the same way, I keep my hot spots at 86 for my Blood Pythons. On top of the paper, it may only be 82 or so. But if they go under the paper, they get to the 86.
Make sense?