The correlation between first-time, full-year students' long-term success and their residing on campus proves legitimate across several criteria. Namely, these are that such findings were published on a verifiable, non-commercial website; that the study was conducted by two authenticated professionals who appear on LinkedIn and other websites; that the methodology is clearly defined with multiple academic sources; and--finally--that such findings were published by a Tier One research university.
To clarify your concern about the underrepresentation beyond FTFTF populations: the researchers only extend their intentions to study FTFTFs, making no claims about other groups. Therefore, there is no basis for faulty coverage.
However: the academic sources cited in the investigation are all over fifteen years old, and its data was collected between 2006 and 2014. Therefore, the study's outdated nature may be inconsistent with current FTFTFs' experiences, inhibiting its discoveries' relevancy and, thus, its accuracy.