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Hacktivist deletes white supremacist websites live on stage during hacker conference
(techcrunch.com)
This is a most excellent place for technology news and articles.
Terrorism is the use of force against civilians to influence a nation's policy. This is not it.
I agreed with another comment that this is probably not cyber terrorism, because definitions of cyber terrorism indicate a wide spread impact on people while this only impacts a relatively small group. Your definition isn't quite right either as one potential goal for cyber terrorism is to cause disruption or fear. Terrorism as a general term may be politically motivated but it doesn't have to have the goal of influencing policy directly. Technically revenge can be a goal of terrorism.