I don't think it matters what the root cause actually was i.e. damage caused by a road accident and the subsequent repair by the OEM not correcting any issues.
The worrying part for industry is that HUMS did not detect damage and deterioration in the epicyclic such that it resulted in a catastrophic failure.
Indeed! That story is not nearly confidence inspiring enough to return it to service. There must be a clear way how to make sure this doesn't re- occur in future. Hoping that no one ever dings a gearbox again does not fulfill that. Besides the obvious question if the MGB od G-REDL was also damaged in an accident.
I seriously hope this is mis- information.