Please read it again: Buyer will send bitcoins to escrow, I'll pm the buyer the walkthrough, buyer will release the bitcoins. If you think the provided method will not work you're free to claim a dispute. In this case the escrow will review the method and will decide if it's working (and will release the coins) or if it's useless (and will return the coins).
And, exactly, what is stopping escrow from stealing your method and returning me my coins. Or maybe I'm not even sending them to him.
This is why everyone suggests you send the method to an hero member: you have no way out of this.