If I remember it correctly, a lot of people had done a great deal of research on this issue way back when the Chinese Threat theory was front and center.
The yellow area you highlighted is a pagoda, Myanmarese being Buddhists they build pagoda everywhere on their land.
There is a small civilian satellite station for myanmarese telecommunication ministry built around late 80's with ADB and/or Japanese loans if I remember it correctly, being an island they need satellite communication as ferry goes there once every month or so.
It used to be Siberia of Myanmar, maybe still is. It used to be a prison for lifers during colonial times, as in Papillon.
There is a small Myanmarese naval detachment there, some aquafarming, and their government fishery personnel stationed in there.
There is only a very small population living on the island. Any amount of Chinese activities on the island is almost impossible to go un-noticed, certainly not over close to 20 years time.
News would have certainly got out one way or the other if was true, especially around that time locals and Myanmarese opposition were pitted against then ruling military regime and that news would have been quite damaging for the junta as their main reason to stay in power was to keep the country intact.
Even by now, if anyone smells something like this happening under their nose, that's going to be a political bombshell for these guys, regardless of who is governing.
So not everything on globalsecurity site can be taken at face value, you have to use your brain as well.
