I've often checked in to Indian defence forums and I have never seen CEC being mentioned or touted as a thing for its Air Force.Possibly. It's believable the Barak and MFSTAR are CECed. Unless the wiki entry is also misunderstanding CEC and it isn't talking about separate ships MFSTAR. Again it's becoming much more common with navies. Since barak 8 and MFSTAR are pretty modern, it's possible they have CEC... although the Barak 8 is kind of short ranged to make it that worthwhile. The strength of CEC is like J-20 flying ahead and painting targets and guiding PL-20/21/22 (whatever they're called) launched from J-16s.
I really doubt the Mig-21 has any form of CEC.
But the Baraks aboard their Surface fleet do get mention ( but here the Brahmos always takes up the limelight. Brahmos gets the limelight wherever it touches - Sukhois, Ships whatever).
Indian Air Force doesn't have CEC. Not even with Rafales that they paid a premium for.