The poster above is way overstating what occurred. The NTSB investigated.

This was testing over four years ago (2022) of their second generation, pre-production prototype running at speeds outside the aircraft's tolerances.

from the NTSB Aviation Investigation Final Report:

The envelope expansion flight test conditions were beyond the expected operating conditions of the aircraft. During the second test flight, and after reaching a maximum dive speed of 181 knots indicated airspeed (KIAS) at an altitude of approximately 8,900 feet, a propeller blade on propulsion station 3 (located on the right wing inboard) experienced a bending failure near the root of the blade which culminated in the release of the propeller blade. The released blade impacted the propeller on propulsion station 4 (located on the right wing outboard), which subsequently resulted in a release of the impacted blade. Cascading effects resulted from the initial inflight blade failures including the separation of multiple propulsion motor/propeller assemblies and loss of remote pilot control of the aircraft. The aircraft departed controlled flight after the initial inflight blade failure and impacted the ground about 0.5 nautical miles (nm) south-southeast away.

So not this aircraft, flying a stress test. There have been since lots of flying hours. New aircraft have been developed from the lessons learned.

Link to the full report (PDF).