I have no idea when that would have started up, but it wouldn't have been before 2021 given Florida's currently nonconference schedule, and most likely not before 2023 since the Gators have South Florida scheduled for '21 and '22. So even best-case it wouldn't help UCF near-term and most likely it would be a handful of years down the road.
Right now, UCF gets Stanford at home and goes to Pitt for '19. There's a home-and-home with Georgia Tech for '20 and 22, a home-and-home with Louisville for '21 and '22, and a 2 home / 1 away with North Carolina for '20, '24 and '25. So there's opportunities to still add other P5 schools, but you're hoping that whoever you schedule down the road is going to be good; if they suck eggs, you're SOL in trying to build street cred as a good program who's willing to go play good programs.