That would suggest PL15E rather than full-up PL15 which requires mid course data link, which is what the missing antenna does on PLAAF J10Cs I think.
I don't think we have any idea what the datalinks on PLAAF J-10Cs are for.
I've always doubted if they were only for datalinking with PL-15s, given PL-15 should be able to use standard datalinks and should be missile dependent.
And PL-15E would be operating at a range which would require advanced datalinking capability anyway, not too far from what standard PL-15 has.
I've rather speculated if the J-10Cs extra datalink was for receiving high bandwidth transmissions from friendly 5th generation fighters.
Given PAF won't have any 5th gen fighters for a while, it is natural that they would lack this capability.