You can read the first 20 pages or so on bookwalker for free and decide for yourself.
From my quick reading of those pages:
Too basic? This depends on your level but it is aimed at native speakers.
Interesting? Seems so, it opened the discussion clarifying higher level structures of the language and from the menu it will later dive into more nuanced aspects.
Useful? As it targets native speakers whose strengths and weaknesses in the language is clearly very different from 2nd (or nth) language learners, it’s marginal usefulness for such learners beyond “an interesting read” would be limited. Case in point as you’ll see by reading the first pages yourself: We probably all started learning Japanese grammar by placing great emphasize on the verb (or i-adj) that’s anchoring the sentence at the end, thus naturally don’t have the biased view of “A sentence is constructed as S+V” that the Japanese seem to teach in their grade school grammar classes. This makes the author’s attempts to correct that ‘biased view’ interesting but not useful.