No where in the article was there a call for a DDoS campaign. They're saying to be active in the protest of SOPA by putting it on your website and by encouraging other to do so as well: "Encourage friends, businesses, organizations, social media to take a stand along side us in the same way. Use/distribute the OpBlackOut material we’ve provided for this purpose, or make your own (but please try to be concise and indict SOPA specifically so the message is clear, unanimous and omnipresent)"

Yeah, reading it again I see the .zip file for download. I think the message would be more accessible if they had an example site that didn't didn't require one to download and unzip stuff onto your local drive. (hmm...)