I don't think that Satoshi failing to keep his word in this instance counts as him lying, though. Yes, he told Pigeot that he'd return when he finished his errand at Daidai Island, but he didn't say that with the intention of purposely misleading Pigeot. He just had other things come up, which distracted him.
My point is that he shouldn't have made such a big commitment that he'd never keep.