From What I've heard and read, the guy or anonymous tried to make a deal with AFN to clear-up quite a bit of bullshit on AFN, AFN rejected the offer and banned them/him, later then he hacked AFN and dumped the database and attacked the site.
Also, a DDoS requires quite a bit of infrastructure pre-planning to launch a coordinated attack. AFN is not secure. Chad reported 3 critical vulnerabilities about the site and claimed to have access to the database days prior the site went down. The AFN database has been dumped and i've read through the PM's.