I think the advice is basically sound. But it is not new or different from anyone else's advice. He has a tendency to beat a subject to death, taking 40 pages to make a statement that could easily be communicated in a single paragraph. He may know a lot about writing but his style is tedious, redundant and awkward. The examples are good except the examples from his own work seem to be the worst. I say he should stick to editing and forget about writing about writing.