He's just repeating what he's heard/read. I wouldn't be surprised if he didn't know about the studies surrounding fasting, I don't think he's ignoring them, I think he's ignorant they are out there.
Eating 2 to 3 hours is the worst thing I ever tried to do. I say tried because it was too hard unless I ate tiny meals that never satisfied me. It was a royal pain planning 6 meals and sometimes it was worst to eat the same thing 6 times. Even if a "meal" was a sandwich or a salad, it was just flat out annoying to try to eat so frequently.
One of my bosses seems to never eat. He sips coffee and sometimes has a sandwich or chips or whatever, but NEVER takes an actual lunch break. He's gone entire 8-5's without eating. To cap it off, he usually goes to a bar to drink after work so most of his calories come from beer and bar food at least monday through friday, his body comp is normal, he's not fat and not skinny. What I take away from that is that he's eating shitty food, but not enough of it to make him fat. He's so used to it he doesn't get too hungry. There is the possibility that he munches more often than I can tell since he's in the cube after mine, but when I walk past his desk there's only evidence of food 20% of the time.