I think it's only Hotel guests who booked pre-Covid who (should) get Fastrack, and that's usually just unlimited for the first hour. It's certainly not listed as a park for staying there currently. That and those who pre-booked will make up a tiny percentage of people going.
There's no Passholders who are entitled to Fastrack either (unless people bought the season Fastrack pass if they offered it during off-season, which again will be a tiny tiny proportion of people).
Thorpe haven't been offering Fastrack in a normal sense though; just to a very small proportion who booked it 5+ months ago.