He didn’t have an explanation for any of that, other than the possibility that some other humans had taught them the language, but if those alicorns were as immortal as Spike implied, they’d remember them. Or at least remember something about them if they were somehow older than they were. And if nothing else, they would not be as alarmed or surprised about Handy being an unknown creature ‘from across the sea’, an unknown agent from an unknown human kingdom. Hell they’d know that for the obvious, blatant lie it was if that were the case, and would not only call him out on it, Princess Galaxia would not be nearly as interested in ‘acquiring’ him because of his claims. If they knew anything about Handy’s true origins, they’d have at least shown some interest, beyond doubtlessly trying to verify his ‘across the seas’ claim as he suspected they’d be doing. If they knew about humans, what humans really were, and where they came from, they’d either be entirely disinterested or consider Handy such a threat that he’d already be buried six feet under by now.