Not Anonymous. Nowhere does it say it was Anonymous or any affiliate. And this article (http://www.geek.com/articles/apple/apple-website-hacked-coul...) linked elsewhere on HN specifically says the hacker denied being linked to them.
http://twitter.com/#!/AnonymousIRC/status/87426935390609408
Also, the geek.com article you listed states that there is no connection between the hacker idahc and the pastebin, which does not preclude Anonymous from having pasted it:
"After idahc successfully discovered vulnerabilities on an Apple business website, a dump of more than two dozen usernames and hashed passwords appeared on Pastebin — though he claims the data was not posted by him. "