I admit I haven't read any other previews of the game, but the anti-hero part certainly didn't come out from the site. Other than wanting to know when he could live in peace (which seems, to me, a pretty typical wish for a soldier in a 40+ year long war), he just sounds like an old guy who didn't get the promotions he had coming to him who's taking orders from a young chippie and a psych-case who likes cool toys.
And I think Heller would have written something more profound.
It's not a major issue, the game itself sounds fun and I'm sure they won't have the main character stop to pop some advil and rub down with ben gay after a particularly tough firefight, so the oddities about his description have minimal impact. I just was struck by how funny it was as I was reading it. As long as he doesn't have a mid-life crisis DURING the game, then I'm fine with it. Hell, by the time the game comes out, he won't be all that much older than me.