WRONG, he has it right, the thermostat probe should not be inside the enclosure.
The idea is to read the hottest possible temp the snake could lay on.
The thermometer probe goes inside to read that temperature, directly on top of the UTH
Every single probe I own is taped to lay directly against the flexwatt heat pad, outside of the enclosure.
Never make the hot spot higher than 95, I prefer 92 myself,
but I watch mine all the time as I am a stay at home dad.
If you need more heat you need to up the wattage of the bulb, but for sure don't go higher with the UTH.