He supported anonymity for publicity and did a lot on his site to dissuade its use. When he gave interviews on 4chan, he used to tell everyone that "4chan is not anonymous".
About the only thing that's left on 4chan that's "anonymous" is the default username: which is still "Anonymous".
You have more anonymity on HN with a throwaway account than you have on 4chan.
People also give him too much credit when it comes to community organizing as well. He got lucky with 4chan when he copied 2chan and catered it to english-speaking audience. When he tried to actually create something from scratch, both of his apps failed miserably.