I'm not so sure there is any cover-up, although disappointing that a detailed report hasn't been published for all to see.
Astonishingly, I believe the first cockpit indications of a problem were probably inhibited by the EICAS (or Airbus equivalent) until the aircraft was above the usual 400ft agl, then the default high thrust setting rapidly became a steady 'flight idle' when the thrust levers were retarded to try to contain the issue. With only one engine operating normally, and 3 at a very low power, a forced landing was the only option.