I would have thought the Airbus System Logic would prevent gear retraction on the ground? I'm not suggesting the gear lever was selected up, but thought there'd be a general logic to prevent gear retract on the ground?
most a/c have a squat switch that will prevent gear retraction on the ground. It can be overridden during mx ( the article stated "undergoing a landing gear system check"?). A few people have lost their job after an aircraft was found kneeling (the main gear is usually different). Can also be mechanical failure, but I haven't heard of that happening on A330 yet