Honestly Phil comes off as so mentally unstable that I could easily see him leaking all that information himself. Whether it was him or not though it certainly wasn't 4chan, as anyone who browses could tell you how hilariously fake the statement "I am the head mod over at /V/ and leader of 4chan.org and Anonymous." is.
Given the nature of what was doxxed (basically ALL his banking and financial information that could be used for ID theft, it's obvious it wasn't him. But yeah, it wasn't 4chan either.