Of course the transcripts are authentic. Of course Arnab had an inside view of what was going on. And btw, in one of the chats he says Pak lost an F16. I hope the Pakistanis believe that too now.
The chapter on that closed a long time back by defense experts, some in your own country. Would be great if you stop whining about it. Yes he had an inside view. The inside view about the F-16 loss is a fallacy at best and a sham at worst since no credible evidence available to your own airforce to conclude on that. So his peddling of the inside view doesn't matter.
If he writes tomorrow that the earth is flat based on his inside sources, wouldn't mean it's true.