To be precise, Yudkowsky called for a wholesale ban of AI research, not for an international agency which could build it. What would a corrupt international anti-AI agency do, let some GPUs bypass its monitoring? But a rogue ASI-related project would require rogues to create the GPUs, use them to create the ASI and be aware that If Anyone Leaks It, Everyone Dies...
To be precise, Yudkowsky called for a wholesale ban of AI research, not for an international agency which could build it. What would a corrupt international anti-AI agency do, let some GPUs bypass its monitoring? But a rogue ASI-related project would require rogues to create the GPUs, use them to create the ASI and be aware that If Anyone Leaks It, Everyone Dies...