>>49749871He's just a really private dude. He's done a few interviews over the last few years but only with other GameFreak staff (eg. with Ken Sugimori) and only for places like Famitsu.
He seems much more content with just sitting back and playing the games rather than having any hands-on development with them in anyway. Masuda and Ishihara take care of all the big decisions.
It might be aspergers, but there isn't actually any sources for that.