Not sure if you are referring about his post but if it's about the XRP only then no, you don't really need to. XRP is like any other crypto which are speculative, so it's okay if you can just say something especially about the price (i.e. prediction) and then it didn't happened. XRP, despite its supply that have been discussed by other members, it is still possible for this coin to increase its value even a little more, same goes to when its value goes down but the more its value can go down than compared to when it goes up, for the same reason that is said earlier or about its supply. XRP also had some anomalies and some says that it was like a shitcoin. This is another reason for the dumping of its price.