Indeed. Von Neumann was an incredibly prolific scientist, and definitely one of the greatest geniuses in history, but that doesn't mean that he was always justified or right - he was still human, and had biases, and made mistakes. His work was still built upon by others who managed to gain understanding of the subject beyond what Neumann did, though certainly much more slowly, and he himself built upon the works of others. He was definitely a class or five above anyone that is likely reading this and probably even more above my own, but he was still a human.