It’s a book review not an article with an argument to make. The concluding paragraph makes no claims:

“This book isn’t a book of answers; it is a book of questions and discussion resulting from those questions. The only certainty one might derive when they have finished reading it is that the only chance we have in defeating the ongoing march towards greater catastrophe wrought by human subjugation to capital is to be found in the struggle against capitalism and in organizing that struggle.”