Infrasound counterarguments
All nine hikers would have had to reach a frenzied point from the infrasound that they evacuated as fast as they could without grabbing outdoor gear. They would have known the dangers. And the physical impact of infrasound that would cause a panic to get out of the tent would have had to reach such a pitch that they felt the need to cut their way out of the tent instead of using the entryway. The entryway had several layers and closed with toggles. The entryway would have required some extra seconds to open, but the hikers would also have known that cutting open their tent would damage it severely. To be useful for the rest of their trip, the tent would have needed extensive repair. And the panic would have to happen to all of them nearly simultaneously.