>Who is this guy?
He was the guy running doxbin [0] before Onymous seized the servers.
He's trying to provide any relevant information he can to the Tor devs so that they can better prevent attacks against hidden services in the future.
>He talks about inheriting PHP code, is he referring to the original SR source code?
He's referring to the doxbin source code [1], which he didn't write entirely but just improved upon.
[0] doxbinzqkeoso6sl.onion
[1] qhlkmirbijvet2dp.onion