The only studies that are not bone-pressed are not ones that are not recognized by the scientific and medical community as being accurate. Even if the PE community created the term bone-pressed, that doesn't mean they created the process of measuring. The method of measuring length from tip of the glans to the pelvic bone is even more valuable now with the vast majority of overweight people.
To think that these doctors and scientists don't understand that excess body fat can hide inches of the penis, and assume that no matter what, your length is only that of which you can see, is simply asinine. If they were indeed all done in NBP fashion, the average would be far lower than is recognized. But of course by your logic, since the PE community also made up the term non-bone pressed, that measurement method must not be used either.
I guess people of average length, but have 1-2" of fat pad or more, are medically considered to have micro-penis, huh?