Hi Jeff. The wood I don't know. The finishe he tends to use is a Hard Lacquer. I believe it is the same as on a lot of Japanese timber work. Usually used as a dense coloured lacquer but Yasuhiro used it as a clear finish also.
Google his name and you should pull up some nice examples of his work.
As to his style of turning, I agree I couldn't turn like that. It almost looks as if he is scraping, but he shifts timber and in shavings. His tools are a lot different to the style we tend to us as well.
all the best
trying to let the beauty of wood live on (still trying)