The goal wasn't to test the pilot's stomach, though — the maneuver simulates the sonic "thumps" NASA's supersonic jet, the X-59, would generate when in use and flying parallel to the ground. These tests allow NASA to gather data on the ground about the sound the aircraft makes so that, someday, the X-59 (or something like it) could be allowed to fly.
SUPER FAST. SUPER NOISY. In 1973, the U.S. banned supersonic travel over land. The reason? It was just too loud.