correct.
you'll likely only need to bump it 1 degree. so even if you have it set at 92* F with a hot spot reading of 89* F now, bumping it up to 93* F to maintain the inside spot at 89* will be fine and not harm your snake.
EDIT: if your snake is a pusher and moves the hide a lot this might cause more problems relating to heating. you might just want to use this hide on the cool side or as an extra in their enclosure.