Jesus, despite his inartful way of expressing it, all he is saying is look around for more recent Florensis bones, and don't be surprised if you find they survived until relatively modern times. He is also implying that the oral/myth communication protocols of many societies will work across many millenia, as has been documented about indigenous people's stories about tsunamis, earthquakes, and meteorite impacts that happened many thousands of years ago. An island like Flores where modern hominids have lived continually for ~25-50K years or longer is a prime spot for those features to come together.