It listens to see if the user scrolled recently and navigated away without clicking, and then explains her what happened and how to avoid it next time. You can dismiss that message if you like Mac's behavior, or you now know how to disable it. Easy peasy.
So maybe you should update your blog with the fact that this is NOT a case of "Lion breaks the web" but in fact a case of "Chrome and Firefox break the web because they can't /copy/ a feature without stuffing it up"
The author claims "Lion breaks the web". This is false, and the majority of people commenting seem to simply ignore that the problem he sees is caused by third party browsers that attempt to copy a feature in the included browser, but fail to implement the usability/UX part correctly, thus causing the issue.
It listens to see if the user scrolled recently and navigated away without clicking, and then explains her what happened and how to avoid it next time. You can dismiss that message if you like Mac's behavior, or you now know how to disable it. Easy peasy.