"Object Oriented" is somewhat of a misnomer here, at least in the strict sense of the term. But the design guidelines that he presents are sound and useful, and goes some way towards alleviating the "brokenness" of the CSS standard.
The problems that he points out - brittle designs, large files, low maintainability and so on, are consequences of a standard that is too loose, too ad hoc-oriented and based on original design goals that are no longer valid. He correctly observes that successful design demands a clear head and great deal of discipline.
