Surely GSX removes default ground vehicles in MSFS 2024, just tried it and it works.
There has been a change not long ago, caused by a change in MSFS 2024 where they fixed a bug we reported 3 years ago in MSFS 2020, and it was that jetways weren't present in the list of Simobjects when asking the "ALL" objects category, we needed this *before* the SU12 Navdata API update where better methods to detect jetways were added. So, even if we didn't need that, this bug was fixed in MSFS 2024 SU2, and this caused GSX removing jetways when activated, because now jetway DO appear in the list of Simobject when using the "ALL" category.
Because of this change, we had to update GSX that, instead of searching "ALL" objects in a gate, it will only ask for those flagged as "Aircraft" or "GroundVehicle", to prevent removing jetways and possibly other objects from the scenery. This might result in some objects that might have been removed before, not not being removed anymore, but of course we must use this method, to prevent removing jetways, so the change was necessary following the change in the sim.