Do colleges with test-optional admissions inflate their U.S. News ratings?

Jay Mathews:

Some readers mentioned, after a recent Admissions 101 discussion of using the average SAT score of the incoming class to pick the school best for you, that this method might be ruined by the growing number of colleges that do not require SAT or ACT tests. Some even suggested that these test-optional colleges might look better than they are on some measures, like the ranked U.S. News college list, because the lowest scorers in their freshmen classes are the ones most likely not to reveal their scores, and thus by not revealing, raising the freshman class SAT or ACT average that forms part of the U.S. News formula.