There are way more cultures that are supposedly a lost tribe of Israel than there were lost tribes of Israel. Also, Japanese peoples' noses are way too small.
Hrm. What they're implying is perhaps an israeli tribe settle there and merged their culture with locals. It's not to say that japanese are israelis. but perhaps there's some judea blood in the pool somewhere.
On the other hand, a lot of cultures around the world, separated by great distances, have similarities for no obvious reasons.