This is not true, empirically, for the reason I've been arguing for over a decade. Criticisms about something called "The Left" have no content. What is "the left"?
What left organization holds to the view described here? What important left writers? Are those who proclaim a catastrophe at all central to actual left practice, or do they only exist in books, articles, & web sites.
The book itself, as described in the blurb, seems to exemplify some sort of catastrophism -- or at least fairly silly hand-wringing.
Carrol