Hate to break it at you man, but look REALLY HARD at the badge, those ain't PAP SWAT, those are Beijing Police SWAT. You see, in major cities and those that got the budget to get better gears, that's what they do.
As far as I know, all SWAT are chosen from either the PAP or maybe even PLA units, so what is the point in this distinction? Does it matter in the slightest which city they come from? They are all still Chinese state security personnel. Surely you are not suggesting that the elite police forces of the Chinese capital are somehow separate from the Chinese government?
or just props / airsoft AEG for drills.
And this is based on what exactly? Surely not wishful thinking?
AFAIK, those SWAT with the P90 and MP5s were part of the Olympic security detail. But it makes no difference whether they were a special limited purchase evaluation or not. The important fact is that the PAP seem to be able to import the latest western small arms and optics as they please. This is backed up by the fact that the PLA sniper team that recently came 3rd in international competitions were using American made sniper rifles.
And none of this is news, as I have know about it for years, as I'm sure many others have as well.
The original picture looks pretty genuine, and is probably just the PLA playing around to see how the holographic sight work with all their rifles.
The fact that the soldier seems to be ignoring the optics and is using the iron sights either indicates a very poorly designed adaptor or one designed specifically to allow the retained use of iron sights.
Edit:
PS, if you look at the 3rd picture I posted, its hard to tell for sure, but the P90 looks like it has an ACOG scope attached.