Is it possible he got his wires crossed and is thinking of something that got approved for Beijing or Hollywood?
Potter seems unlikely given their inability to settle on a concept for the ride, and the lack of viable locations following the MOM. Unless it's an outdoor ride, it's also hard to imagine it will open by 2025. Creature is the fan-favorite rumor, but always as a phase two addition.
What makes this harder to parse is that whenever rumors have emerged for complicated, 'game-changing' ride systems, those rumors have faded or the systems were canned. Potter and Jurassic World both replaced their suspended systems with modified SCOOPs. Ambitious trackless concepts for Lorax, Pets, Monsters, Minions, and Potter were all scuttled. Barring a few exceptions like DK and the carousel, it seems like Universal's goal with this park has been to develop highly immersive and practical variations on ride systems that already exist (coasters, Kuka, spinning Busbar, SCOOP).
EDIT: I'll just say it. I don't believe him.