This story doesn't make sense to me - there is more to it than is being reported.
The aircraft will not leave its cruise level unless the MCP ALTSEL is reset, or the Autopilot is disconnected, which would result in a loud and continuous AP disconnect warning as well as an altitude alert.
I believe some Indian and Indonesian carriers have FOs that are there just to fill the seat, and rarely allowed to do anything useful, like landing and taking off!
The report says she had to wake the captain and that he returned the aircraft to its correct level. Scary stuff.
And they thought they could get away with a 5000 ft altitude bust in RVSM without reporting it ??? And no official report by ATC??
