It’s wrong and misleading, and the "it’s Austria to save you a click” makes it worse, since you are inviting readers to digest this knowledge using only your misleading title and that sentence.
It’s rather amusing you can’t be bothered to fix your title when you know it is clearly wrong and you are willing to instead spend time defending your title in the comments.
There is enough poor content and misleading journalism on Reddit and elsewhere, I’m not sure why you want it here.
Now, since Austria is the happiest country in the EU it is quite possible also the happiest country in Europe. But we don’t have any source for that, so why defend it?