I assume you are using this information to try and discredit the boy's claim that they thought he was on the 'ship'.
Hindsight is always 20/20. Would you have immediately called off the rescue squads following the 'ship' based on some technical advice? If you had it at the instant this all started? What if you turned out wrong?
There were 20-25 mph winds, with higher gusts. I have seen planes that were tied to stakes buried in concrete take off and fly (albeit not very far).