They didn't even state when it would have been out in April before the outage, so I think he's just bullshitting to explain the delay for yet another one of Lords' DLC chapters.
Yeah, the only means of purchasing and downloading Resurrection (PSN) being hacked, taken down, hopefully being reworked so that it doesn't happen again, the logistical nightmare of dealing with the aftermath of personal information for tens of millions of users being compromised, and all the while Sony Executives dragging their feet in dealing with the PR situations; this won't affect Resurrection's release date at all.

That being said, I agree with you: MS was probably behind schedule in developing Resurrection regardless.