Regarding the original post (and title of this thread), it is highly questionable. I checked the Rabbi’s blog, and all he does is refer to one “unpublished” study he says that he looked at, and another unnamed study. We have no idea what these studies are, who did them, what their quality is, and whether they are even correct. He provides no link to further information.
For example, are these studies of a single high school? A small handful of schools? Of a MO school in which half the kids who go there aren’t even MO? What is the sample size? Response rate?
Without any information about the studies, we have no idea what they measure or whether they have any validity whatsoever. As of now these are basically second-hand rumors about studies, which obviously no one can draw any meaningful conclusions from.
I’m sure some communities and some schools or colleges have higher OTD rates than others (YU/Stern or Touro vs public universities, for example), but the fact is we don’t have any data to prove it one way or another.