That is easily the most brow-raising claim there and threatens to discredit the whole article. However, if it had truly happened, then I imagine that the WS-10s were custom revised so their their support equipment (fuel lines, inputs, wiring, perhaps even the braces if new advances in material strength allows) were shifted and directed more to the sides to make more space in the middle so the bay could be expanded slightly. I still have great doubt, though...WS10 is about the same size as AL31, how would just that change allow 6x PL15?
Wait so there's two smaller bays in the weapons bay that can only take 2 missiles each? Why not design it simply as a single bay and fit 5 missiles into it (from what I'm seeing on photos I think 5 PL-12 missiles can be crammed into there. 6 is just impossible.) As for PL-15 missiles I suspect it will be carried by fellow J-16s staying behind the front line of combat and fired when notified by the J-20s or AWACS. Or maybe they will be carried by UCAV drones as some sort of "loyal wingman" setup.But this was discussed ad nauseum ... each time again with the same result: There si currently not enough space for a 3rd PL-15 in each bay, period!
As such there is also no need to open up this can of worms again.