Nope, this "news" is not worth reporting (and not worth the name "news"). The Xenoblade rumors have been reported and were worth reporting. This is not, and barely deserves to be quoted in a user post on another thread. Really not worth an article, videos and new threads. There is a difference between people saying "I have a source telling me the game is coming", and a Nintendo employee saying "Look, there a Switch event next week" just like last time (and no mention of anything related to the game). Where was the same thread when she tweeted about the Switch's reveal in October?
There is a meta-thread for Switch rumors anyway, so it definititely doesn't deserve its own thread.
According to whom exactly because other outlets are reporting it which shoots down your stance, you can't even get the context of the news right in your attempts to argue against it as the article even explains why her retweeting events causes interest so yes it is news worthy.
And her tweets are not 100% about Monolith news: she promotes Nintendo related software in general.
There are countless other threads related to the Switch reveal and rumours: that is what those threads are for, posts like this. So use them.
Who are you to tell the OP where to post his news, are you going into those other threads to tell people to keep it in one thread? No you're not so put up or move on, her tweets have had a record of indicating an announcement which is why the OP reported it so he's in his right to report it regardless of your moaning.