Front Seat Belt Anchorage problems of the 1996 Mazda 626

Consumer friend was driving at approx 35 mph suddenly another vehicle jumped out, in order to avoid hitting this vehicle, consumer hit parked car head-on. Both airbags did not deploy, due to this defect, driver sustained extensive head injuries, hit steering wheel . Seat belt was also worn at the time.

Second replacement of the seatbelt. Is this a manufacturing defect? seatbelts shouldn't have to be replace 2x within a four-year period.