VCOM doesn't give a crap about your MCAT tbh. They're big on GPA. As long as you can provide a baseline "I can take a standardized test" (they have to draw the line somewhere), they care much more that you could succeed in the classes they provide. This program is the ultimate win-win for everyone. Students who barely had a chance get a real opportunity to get into med school, which VCOM matriculates a hundred students who have effectively been bootcamped for a year to succeed in the way they teach. They could increase the MCAT or GPA benchmarks, but to what end? The program already selects the students who do well to get into their main campuses.
They could also be more selective on admissions to the program itself, but again, to what end? They already are getting a large chunk of their students through and into a medical school. It's really difficult to be more successful with the outcomes than they already are. It's not perfect, but the results are pretty damn good as is.
Also just a note, remember that some of those "guaranteed interviews" are effectively guaranteed acceptances too with a failsafe for students that they don't want matriculating for other reasons.