I find his view on kata a little limited.
While studying the kata of the style I practice, I have found many ways to apply certain techniques from kata. Kata also helps positioning yourself against an opponent. If you fail to realise that kata is stylised on embusen, then you can't really discover what is going on. Take for example the more 'basic bunkai' of throws on turning points in kata and the ways in which a gedanbarai can be used. (Downward block in my opinion is way to limited to describe this 'low sweeping recieve'.)
The writer does offer nice approach on the matter.
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Ives