I think the author is pointing out that the Kindle version of Dune is terrible. Horrible typos, bad formatting, etc.
Unfortunately, many middle-aged books have this problem, and unless you can wade through the Amazon reviews (which are not format-specific) and find out, you don't know whether the publisher just copy/pasted a text file and hit PublishNow! or actually had an editor sit down with it, mark chapters, fix typos introduced, un-break words if it was scanned, etc.
Just to chime in with a little more strength than an invisible upvote, this is one of those things that doesn't sound to annoying until you're experiencing it yourself.
I used to read reviews complaining about it and think "stop whining" to myself, but now that I'm ready books that I paid for and which clearly went straight through OCR software with no human supervision... Really, really frustrating.
Unfortunately, many middle-aged books have this problem, and unless you can wade through the Amazon reviews (which are not format-specific) and find out, you don't know whether the publisher just copy/pasted a text file and hit PublishNow! or actually had an editor sit down with it, mark chapters, fix typos introduced, un-break words if it was scanned, etc.