Why don't you post a rejoinder here? For the benefit of this blog.
His arguments are actually too stupid to refute, but I'll do it anyway. His arguments can be surmised into 4 points.
One: China now has stealth aircraft, which makes them immune to the radar-reliant S-400.
Two: Western aircraft like Rafale, M-2000 etc will be picked up as enemies by the S-400. Meaning the IFF, friend or foe systems, will not be compatible.
Three: The Russians will not provide the source codes necessary to integrate the S-400 into our grid.
Four: S-400 sucks, it won't work as advertised. He goes on to literally make up reasons for it.
Rebuttals:
One: Radar vs stealth is not black and white. And as our air chief has already pointed out, the Chinese stealth is not so advanced that it creates asymmetric capabilities. Although at lower ranges than conventional aircraft, the S-400 can still shoot down the J-20 at a long enough range. However the main advantage of the S-400 is in its ability to target HVAs like AWACS, recce, EW, tankers etc at extremely long ranges, which can significantly decrease the potency of the J-20. The J-20 itself will have to be killed by fighter jets of our own.
Two and Three: In both cases, we do not need anything exceedingly special from foreign countries. We will use our own IFF, comm and datalinks. As such there will be no problems in integrating the S-400 into our IACCS. So there is no need to operate the S-400 as a standalone system. In fact, Turkey planned to integrate the S-400 with their NATO systems. As for the F-35, the Israelis have specifically modified their version to be able to network with their indigenous assets. So if we are interested in buying the F-35 some day, we can opt for the Israeli modifications ourselves. There's nothing in American inventory that we cannot integrate with the S-400.
Four: He's given ridiculous reasons, like something about heavily networked radars, terminal accuracy etc, all *censored*-pulled.
There's one important point he's made about the PAF F-16s capable of being equipped with the capability to defeat the S-400 since the Americans have extensive experience with the S-400 in Syria. Yep, he's entirely talking out of his *censored*. Nobody gives up their threat libraries to anybody else, especially Pakistan. It's priceless information. And it's not like Russia is using the actual capabilities of the S-400 in Syria or anywhere else anyway. Peacetime operations use completely different frequencies compared to wartime. So even if by some magic, PAF gets their hands on some signals to update their threat library, either through China or Turkey, it won't affect India since we are capable enough to make our own signals in due course of time.
Overall, it's an extremely low quality article.