From that pastebin:

"9. Alice's Escrow awakens in 1-5 minutes, and starts periodically checking (via SEPA calls) to see if BOB_SEPA has received the Euros. If so, she automatically releases the Escrow to Jorg's silver account on OT."

This escrow must be able to check the banking transaction via SEPA calls, and I suppose without a formal contract with banks, he won't be able to listen to those calls

Just like a gateway in ripple, this is the point of weakness for all the P2P exchange design: That escrow/gateway must be able to communicate with banks through an authorized channel and that channel is controlled by banks

The core problem is, all of the exchanges today still operate inside a banking framework (the exchange must have a bank account to operate). In order to bypass the existing banking system, there should first be a P2P bank that store fiat money, that bank could in turn carry its exchange without the involvement of traditional banks