Yup, that website has all the info you need. Pretty straightforward; you do 60 CME credits, then take the boards. I'd pick one of their obesity courses (there are 4 options) rather than try cobbling together 60 CME. I did the Columbia on-demand option just because that's the first I clicked on. There's an Obesity Medicine Board Review Questions and Practice Test books on Amazon that I got too. I've been told that's more than enough for the exam, it's not supposed to be very difficult.
I think the bigger question is whether the boards are worth anything. In my case, I'm taking them because it's marginal extra effort to study for the exam (I learn best by studying for exams anyway) and because it gives me an extra layer of defense if someone tries to criticize me for prescribing these medications as a psychiatrist. My malpractice covers it regardless but I imagine if there's any medicolegal issues that ever arise, being board certified in obesity medicine definitively squashes any argument about this being outside my scope of practice.