After reviewing the primary radar recording, the turn back was most likely at a standard 25 degree angle of bank left turn.
Failing someone for diverting to the NEAREST SUITABLE AIRPORT seems harsh.
The loss of transponder, ACARS, radio communications, Flight ID, and diverting to an airport is consistent with an onboard emergency.
Another day another load of bollocks from a non-aviator trying to push a logically flawed theory on why a failed oxy bottle forced a 777 to fly from one ocean and crash in another. "Run Fawrrest run"