To me, as a layman, the documents look pretty damning. Sure, Techcrunch did not have a written contract, but I don't see how the language in those emails from fusion garage can be construed as anything but a conspiracy to deceive/screw Techcrunch.
You're thinking of the statute of frauds, and it kicks in at $5000. But there are exceptions.
If I'm reading it correctly, many jurisdictions require contracts to be written when they exceed certain amounts of money. In the US that amount is $5000.
If I am reading that right: Because they used TC office space it is implied that a contract existed and Statute of frauds does not apply to that part.