They don't actually fly them, you know, as much as we fly say F-22s up in Elmendorf or something, so they're not going to be running down that sustainment quite as fast.
Yet folks here also proudly talk about PLAAF pilots outflying USAF in training hours. Not everything is true for all units and all aircraft at all times; there are nuances involved with F-22 vs F-35 fleets and so forth. But at the end of the day, you can't have your cake and eat it too.
USAF units typically operate with more pilots than airframes. IIRC, USAF fighter squadrons are supposed to maintain a 1.25 or 1.5 crew ratio (not a bird brain here, so if anyone knows better, do chime in).
Such crew ratios are especially applicable for units that are deployed, forward deployed or forward stationed like the F-22 squadrons out of Elmendorf, which are responsible for intercepting Russian Tu-95s and what not flying toward or near Alaska.
The Elmendorf based F-22 squadrons are most likely fully manned, if not overstrength.
As such, it's perfectly plausible for said USAF F-22s to log more hours than most PLAAF J-20s, even if individual USAF pilots are logging fewer hours than their PLAAF counterparts on average.
Granted, this might also mean the PLAAF is inducting airframes faster than it's able to train the pilots needed to man them, but let's save that discussion for another thread.