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Does this HoloNet News stuff ever actually impact canon?
I don't think it really impacts things very much in the sense that other sources do not reference HNN very often. What happens more often is HNN referencing other works. The author of HNN is Pablo Hidalgo, who writes the Q&A in Insider and the Set Diaries for Hyperspace. So Pable, being very knowledgable about Episode III and the EU, tries to tie everything together by referencing things from past EU stories and future EU stories, as well as things from Episode III.
So basically you never know when something in HNN might be a reference to Episode III that we won't realize until later.