To be specific:
1. These aren’t philosophies, they are words. The ideas behind these words exist in other cultures as well — they aren’t unique to Japan. If one really wants to push the point that the Japanese version of these ideas are actually different (I could see an argument for that), the difference is not reflected at all in the article.
2. Related to 1, I don’t think that these ideas/“philosophies” are particularly prominent in modern day Japan. Maybe… maybe in some circles, but I don’t think that these ideas broadly represent the current zeitgeist.
Maybe I’m just too cynical about the personal finance blog genre, but I don’t appreciate the author co-opting a rich culture in such a vapid way.