BYU ran 7 plays AFTER the 4th down defensive holding call. UU didn't stop BYU.
By the way, no one will miss UU if you decide to return to the Pac12. Rumor has it that 1) it's what you want, and 2) they still need an 8th team.
(By the way, the replay shows a legit holding call on that "stolen" 4th down play.)