What’s with the alarmist headline? It’s reasonable, and fairly common for a commercial airliner pilot to have a simulator at home.
I have a friend that has flight simulator software on his computer. He’s been crashing into carrier decks for ten years!
It’s the Daily Mail. Sensationalism is their stock and trade.
Also, far from being "revealed", the existence of the Captain's simulator rig has been common knowledge since shortly after the incident.
Just one of many stupid, alarmist musings surrounding MH370.