If high school rank counts for a possible 3.25 points and Tufts didn’t report that statistic, then they received 0 out of 3.25 possible points. Reporting a “poor” statistic would only help their score, just not as much as a school with a higher 10% high school rank. But I don’t think anyone believes that their statistic is any less stellar than other colleges in its class.
That being said, this infatuation with these rankings is ridiculous. If anyone really cares whether the school they’re associated with drops two or three spots, they need to find a better use of their time and brain power.