Anonymous is a brand not a group. A free brand that anyone can use if they want. What the brand represents is just the aggregate of the many individual actions done and opinions put forth under its banner. How has this purported attack impacted the Anonymous brand?
Typical of semi-official "professional" journalism, TFA does not give any details about the target(s) of the DOS attack. But isn't that a key piece of information if we want to understand the situation? The alleged attackers could be engaged in civic activism, a boycott / blockade / picket line, vandalism, extortion, insurgency, (anti-)religious fanaticism, guerrilla war (with or without a traditional government sponsor or opponent) - anything really. Or they could just be script kiddies in it for the lulz. Does not our perception of the attack, and thus of the attackers, depend in greatest part upon the target?