Well you see Chiba Sensei's intent when he formed Birankai. That passage is from Birankai's home page. This has been an issue for some time. And its clear, that non Japanese will not be getting Shihan titles from Hombu.
The Birankai was formed some time ago, and quite a few Shihan titles have flowed out of Hombu to non-Japanese since then, up to and including this year. So how is it clear that non-Japanese will not be getting Shihan titles from Hombu?