after 30min here at a KLAS gate I'm not seeing people. Plenty of carts and all but no people for any airplanes.
If with "KLAS gate", you mean FSDT KLAS, it would be difficult to see any people, since KLAS have all solid jetways so, before being sure GSX L2 has a problem, you should try a parking in the open, with a Bus and Stairs.
If with "KLAS gate", you mean default KLAS, it's the same, since GSX by default replaces default jetways with solid jetways, so you won't see passengers easily, unless you have a 3rd party camera utility to position your camera inside the jetway.
If with "KLAS gate", you mean another scenery for KLAS, seeing people depends if that scenery has SODE jetways or not. Passengers won't use non-SODE jetways.