It is dangerously close to the canopy for aerial refueling. Anyway, China uses probe-and-drogue, not the boom. I believe the only tankers they have are Badgers with wing pods.
Are you sure that close-up is one from a J-10? Because it doesn't look the same, look at the bulp-up canopy of the J-10. This looks more like that L-15, you posted some pics of in the Yak-130 thread.
I stick with the datalink, the Raptor has one in the same spot. It's close to the cockpit, so avionics wise it makes sense. Not sure if it is also a satellite link though.