Not 100% Sure
Sung-Yong’s information came with a caveat: he was only about 50% certain that the information was reliable.
“To us, the ideas are not new,” Roy Sneddon said. “We have no proof that it’s reliable, to be honest,” said David’s mother. So it wasn’t like they could trust 100% what Sung-Yong said; despite all the coincidences and North Korea’s history, it was just a hypothesis until new evidence surfaced.