Matt Cutts said things a bit clearer with:

“Yup, monchito. WayneSmallman, in my opinion what this post says is “We do a solid job on sites with dynamic parameters, and lots of people make mistakes when they try to rewrite their urls to look static, so you might want to try the dynamic parameter route because that can work quite well.”
In essence, it’s Google saying “We’ll come to webmasters and the natural way to write dynamic parameters rather than asking you to rewrite everything as static if you don’t want to.” So we’re trying to come closer to webmasters, not wanting webmasters to necessarily move toward us. If you already have a site and it’s doing well the way that it currently is–great. In that case, you probably don’t need to change anything. But if you’re starting a new site, it’s worth considering staying with dynamic parameters instead of doing large amounts of rewrites (which some webmasters do in unusual ways that don’t always work well in search engines). That’s my take, at least.
It’s not like either choice would get you penalized in Google; all of this is just advice to give more information to webmasters when they’re making their choice of site architecture.”

http://sphinn.com/story/74522#c54232

Maybe the writing is more to blame than the content.