I was expecting something a bit more comprehensive and damning after the link… but if one of the most objectionable and controversial claims in the book is about adverbs modifying “unique” I think I’ll continue to recommend elements of style.
Why should one use a book on English grammar that can't correctly identify English grammar in the first place?
Out of curiosity I googled "we intend this book" and people do seem to use that wording sometimes in introducing their books. Why don't Strunk and White do that?
This reads like plain bad faith. Pullum lists a dozen or so very specific problems with S+W, and goes on at some length about the evidence against each. Any of those problems is more objectionable than the "modifying unique" thing, which Pullum mentions once in passing but doesn't discuss.
There's a reason linguists hate S&W. It's really not good.