That 72% includes students who submit both SAT and ACT. UVA does not make pre-2021 CDSs available, but I’ve looked at them for other top-ranked institutions, and they show totals of ACT + SAT submission percentages of ~115%.
Assuming that was the case for UVA, as well, and that a similar portion (15%) are still submitting both, the actual percentage of enrolled students submitting test scores is probably in the low 60s.