If Dave Arnold says he really doubts it, it's a pretty safe bet he's read like a dozen papers related to the prediction and is basing it on something. He's like the Bunnie Huang of cooking.

In the article the only explanation he gives is that it doesn't make sense to him, doesn't mention any papers or anything at all. But I'm pretty certain that he's wrong and it works. The difference in gas if I've been eating beans recently vs if I haven't eaten them in a couple of months is not just "I feel like maybe I get a little bit less gassy maybe" it's going from "two dozen farts at least, guaranteed" vs "one or two, if any at all" it's a night and day difference and if there even was a paper that says the contrary rather than change my mind I'd just assume that there must be something wrong with how the study was made. Of course, I'm just a sample of one and I haven't done any study either, so I don't mean to imply that there might not be other factors or that it may not work to the same degree for everybody, only that I'm pretty sure that dismissing it is wrong because I know at least one counter example.