from the study "None of the respondents were being actively recruited by Power 5 football programs as the goal of this metric is to measure program perception WITHOUT the influence of recruiting activities as this could potentially change the way a recruit perceives a school."
There is probably some truth to your assumed perceptions of BYU being religiously affiliated, but they purposefully did not include recruits that were being recruited directly by the P5 schools listed, so that had no sway on the result as you surmise.