There is so much misinformation about ETOPS and EDTO in this thread and assuming those speaking "authoritatively" are currently pilots operating in the environment it brings into question the quality of the training being provided by some airlines.
Area of operation is determined by 240 minutes at two engine cruise speed...
If EDTO area of operation is based on 2-engine cruise speed, then you're right, it definitely brings into question the quality of training I received. And my outfit's manuals are so badly in error that CASA should probably just shut the whole joint down.