I won't argue that he's not extremely intelligent, but he was getting pretty full of himself. He's still a military officer and he was making way too many waves on social media. He was using his platform to campaign for the ideas in his book, and that type of stuff is frowned on by the military. They don't want their subordinates influencing public opinion, they just want them to follow orders. He was tasked with studying Bitcoin, but they probably wanted him to keep his findings internal.