It's not AI. It's just rendering the game at higher than the display resolution then downsizing it to the actual resolution. Nvidia and AMD offer something similar on their graphics cards on PC and they look great vs normal anti aliasing.
We don't know what it is, since this is all rumor but..
It's being compared to DLSS, which is AI.
Whether PS is doing plain supersampling or AI supersampling is unclear. But since they're saying it's a performance gaining supersampling, it's probably AI since regular supersampling is worse for performance.