The author of the site referred to it, in an NPR interview, as "stuff NPR listeners like".
The whole anti-Eastside thing is annoying. I just moved (back) to the Eastside after living in a number of different locations in King County, in Seattle, and not in Seattle. For the wife and I, it fits our needs with respect to:
-proximity to jobs that *we* work at
-proximity to things that *we* like to do at the weekend (hiking, biking, chilling out on the deck with the nice view from a house that didn't cost over a million bucks)
We still go to Seattle to the art museum, sports events (when free tickets demand my attendance), restaurants and to see friends. We're able to do so because we have this invention called a "car" which, by the way, we use less now because we're closer to our jobs.
Some people with the anti-Eastside bent seem to to think that the only way for everyone to live is within walking distance of a coffee shop and with constant 15 minute access to the art museum.
If anyone out there with this anti-Eastside disease is reading this, take a while to consider why you're so judgmental when other people choose to live somewhere different to where you live. Consider that there needs, desires, and situation may be different to yours.