This is from the help section
"Your hub's content has been detected on another site and has incurred a HubScore penalty as a result. You are allowed to post content on HubPages that is also published elsewhere, like your own site or blog - but you cannot place any promotional links on that hub. Only you can see the alert message at the top of your hub and a pattern of publishing duplicate content will negatively affect your HubScore, as we like to reward authors who publish content unique to our site. It does not matter whether or not you are the original author of this content."
So it means that you can post anywhere else. All it does is affec you hub score a little