So the link you cited is to a neat little chart that many undegraduate schools give out to showcase the self-reported stats of their own pre-meds. Who got in with what scores and who didn't get in with other scores.
As the article itself shows, not all students choose to give their pre-med advisors their info and so these are probably not complete.
To answer your question, these GPA/MCAT ratios are primarily for applicants to use as a quick guide to decide if they stand a chance of matriculation with scores that fall within a comparable range.