So looking at his points:
"DRM Is Anti-Reader": There's no reason that DRM could allow the easy transfer of a book from one person or platform to another. You could submit a transfer request and the publisher could re-encode the book to the new owner or format. Would you expect that as the purchaser of the book, you'd be allowed to photocopy it and distribute the photocopy?
"DRM Locks Readers In To Platforms": This is not necessarily the case. The publisher could easily offer the same book in multiple formats. Converting from source is a trivial technical task.
"DRM Adds Unneeded Complexity": DRM does add complexity, but as most people read via an application rather than a text file, this can be abstracted for almost all readers. Again, this is a problem with the implementation.
"DRM Stifles Innovation": Authors not getting paid so that they can eat also stifles innovation. There needs to be a balance here, it's not all about making everyone's work free.
"DRM Halts The Spread Of Ideas": If someone can't afford the book, in many countries they can go to a library. They don't need ownership to read the ideas.
In summary, the issue with DRM for books is the implementation. Many of the problems listed are real but could be almost completely negated by the publishers doing things that cost them almost nothing, even following the assumption that everyone wants to read their books for free.
To be clear, I'm not implying that I support DRM or that it really does significantly reduce the availability of books that have not be paid for, just that the arguments presented here are against the current implementation rather than DRM itself.