I think his spiel has been that while blog readers could trivially find out his real name, but his patients could not (searching 'scott siskind' wouldn't bring up his blog in the first n page of results), until this association was made in the NYT. If you search that now the first two results are the wiki for SSC and the NYT stories, and if you look in the wiki for SSC you'll see that his real name was kept off of it (despite weekly-ish edits attempting to re-add his name) up until the NYT story.