That's hilarious, because I'm the one who wrote all the summaries of the startups that she's judging them by. I deliberately express startup ideas as x for y whenever possible because that's the most efficient way to describe a startup in a few words. Airbnb, for example, was in its day "eBay for space."
On Demo Day we accompany each startup's name with a brief summary of what they're doing. The goal of these summaries is not to convey the full breadth of a startup's eventual ambitions, or even what they're currently doing, but just to help investors watching 65 presentations remember which company is doing what. TechCrunch reused these descriptions, as reporters often do. And now this woman has read the summaries printed in TechCrunch and is treating them as if that were all there was to know about the startup. It's like a game of Telephone (http://en.wikipedia.org/wiki/Chinese_whispers).
My standard advice to startups presenting to investors is that it's better to start with an overly narrow description of what you do, so that investors at least know what you're talking about, and then expand from there.
See http://paulgraham.com/investors.html, particularly items 1 and 14.
It's surprising to me that someone who wasn't even at Demo Day would feel confident enough to judge the startups' originality based on the 3-5 word summaries we use on the schedule to help investors keep them straight in their heads.
I was about to say that it's also surprising that people would upvote such a post. But on reflection it's not that surprising.