Texas and Nebraska were both teams that ended with a losing record. Massey composite has Tennessee at 37 (with a chance to move up or down), Nebraska was at 53, Texas was at 51. As I said, the 2nd best road win against a P5 since LaVell.
BYU did play some P5 teams on the road in the Bronco era: Boston College, Notre Dame, Arizona, UCLA, Florida State, Texas, Utah, Virginia, Wisconsin, Michigan, Missouri. Some of those were multiple losses.
We've been unranked pretty much this whole decade. Let's wait until the season is over and look at the Massey composites if you insist on using some computer methodology to compare seasons.