I'm the one who wrote the blog, and really appreciate your comment. As a physician, I can confirm that most physicians have only the tiniest grasp on statistics - and most will not have even heard about Bayesian stats. I do not want to imply that observational studies of correlation are useless - or even that observational studies are "less valid" than randomized controlled trials (something that doctors usually assume, but it incorrect). I actually want to write about this issue in future posts. There is a lot I want to cover, and stats in medicine is one of my favorite topics. One blog at a time, though.