I'm sorry but that's not fully certain and I have grave doubts that such a datalink would be allowed to fall into Chinese hands even for installation on the JF-17. There is just way too much classified and sensitive material in a datalink. IMO, the mention is a wish think. Its not fully certain the Erieye would be bought as remember, China is still offering a Y-8 AWACS as an alternative.
I can tell you for certain that the PLAAF, much like the rest of the PLA, exercise in heavy ECM conditions that "with datalink" and "without datalink".