30km is the range of the old JL-7. So the article is kind of suspect. If the radar is the KLJ-6E, that radar does not have the BVR mode. The KLJ-6F with emphasis on the F is the one that does.
There is no published info about range on the brochures of the KLJ-6F so far. The only difference it appears to have the -E version is the additional modes necessary to support BVRAAM. There might be an increase in performance but that's only speculative.
As for the PLAAF J-7G, its impossible to tell or with absolute certainty what they installed is the -E or the -F. So far we have never seen operational J-7G with the PL-12. If we have pictures to show, then there is proof. Its likely the -F was developed after the -E, and after the J-7G was certified with the -E, so -F may have came too late. The J-7G program began around 2003 and 2004, and there was no info on the KLJ-6F until 2006-2007.
I think the production of J-7G ended even before the F-7BG.
If the improvement is minor, using a designation like J-7G1 or G2 might be possible. If the improvement is relatively greater, it may deserve a new letter, though H is already taken. The next letter would be I.
I think CAC is just hurting itself trying to push a BVRAAMed J-7 if they can better sell J-10s or JF-17s to the PLAAF.
SIPRI reports that both Namibia and Bangladesh F-7s are equipped with Grifo-MG radars.
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