I think his point is: who released it to the public?

Since the document is signed by "Kivin Varghese" and it was posted by user "kvargs", it might be a hint the leaker is actually the author.

If so, isn't he ruining his own career? Who is going to hire him now?

If I were looking for somebody of his background, I definitely would talk to him.

Obviously, a whistleblower like this is dedicated, passionate, and energetic. The question is whether they do this because of real dedication to the customer and good business practices, or whether they're just the sort of person that likes blowing shit up when they find a good excuse.

Some of the top-performing people on my teams have been seen as "difficult". But I don't particularly want to hire obedient people. I want to hire people who will tell me I'm wrong when I'm wrong.

Well, he wrote it, he marked it confidential, he is free to release it under different terms.