This is multifaceted, the answer depending on the perspective, but I think that the most basic answer lies in the phrase itself: Japanese philosophy.
At a mundane level, everyone has a philosophy that governs their decisions, e.g., whether to seek freedom or escape from it, as most do.
Having read Plato's complete works, I think Socrates, Plato, & Aristotle had great originality. Otherwise, the article makes a good point about Greek philosophy, Buddhism & Confucianism turning into sources of authority rather than philosophy.
My view is that Indo-Western thought is abstract, but East Asian thought is concretistic. E.g., haiku are often philosophical, but nature symbolism does the lifting rather than abstraction like metaphysics. See "This is Asia: Exploring the Contrast between East Asian and Indo-Western Ways of Thinking" at https://www.academia.edu/62511123