I agree that wholesale adoption of Agile methods is problematic. But one thing every Agile approach has in common is an inspect-and-adapt component, so I'd call wholesale, ritualistic adoption essentially un-Agile. The Extreme Programming people are most explicit about this: they say that by-the-book XP is a good place to start, but that they don't expect anybody to stay there.
But when I read his examples, it seems like he doesn't know that. (Or perhaps that's the people in his examples.) Agile approaches aren't supposed to make everything better. They're supposed to expose the problems with how you're working so you can fix them. In the first case, it exposed the client's lack of interest and the conflicts of interest inherent in their organization. In the second, it made clear that the backlog was unreasonably large versus staff size.
Those aren't unintended consequences of adopting Agile methods. That's what's supposed to happen. Hidden problems are now obvious, which is progress. He seems to suggest that more planning is the solution, but I think just the opposite: with both those fictional shops I'd encourage them to fix the visible problems, and try to do so in ways that shorten feedback loops and help surface other hidden issues.
[1] http://agilefocus.com/2011/02/21/agiles-second-chasm-and-how...