The article quotes Gavin Andresen as saying "He went to great lengths to protect his anonymity.", but other than that doesn't offer anything to show that he actually was actively trying to hide his identity or was ever using a pseudonym.
If it helps a bit: Satoshi Nakamoto sent all emails over Tor, connected to Bitcointalk over Tor, and paid through the nose for bitcoin.org registrar & hosting services on Anonymousspeech.
