Frankly Gerstmann has no excuse not to state the facts. By giving a run-down of what happened, he would instantly catapult himself to the status of hero-martyr.
As for finances, I would bet money that some top publications in the industry would love to have him on board. It would be a slap in the face to a competitor whose image is already tarnished and it would place the company that hired him in a very flattering light.
I disagree.
Martyrdom is called so for a reason. It generally ends badly for the martyr. Now it's all nice and good for people to become martyr's for the right reasons. Video game journo's? Hah, not one of them. Video games in themselves aren't worth it, as anything with a political or what-have-you message tends to be more of a circle jerk then an actual game. At the end of the day, they're just entertainment and an art form (although the latter can be debatable on a subject per subject basis...)
Nor would him going to another company make him some kind of awesome hero of the moment, nor the company that picked him up. I'd go as far to supposition that Eidos would be putting the pressure on other major labels if they considered picking him up also, if at the very least sending them a message of "don't let him near our stuff, etc".
"Hi there, I'd like to apply for a position at your fine game review publication"
"No worries, wait, did you jeopardise a large advertising deal between Gamespot and Eidos?"
"sure, I stick to my guns and said a bad product was bad!"
"Don't call us, we'll call you"
Why on earth would you hire into your businss someone with an rumour that because of their non-conformity to company policy put a large sum of the company's profit in danger?
Regardless, his contractual NDA wouldn't be something uncommon (I have one, and all I do is drive a forklift). Even if it is for the money, and as "noble" as it is to fight the man, that doesn't feed you, put kids through school or pay a mortgage.