A headline which gives people the wrong impression is still misinformation. It makes the world less informed than before, as people rarely read articles after reading the headlines.

Edit: And it is super important to point out this misinformation in the top comment to an article, so that we can correct as many people as possible. So stating that this is misinformation isn't just some pedantic complaining, it helps correct the view of a lot of people and maybe will help make more people think a bit before writing headlines.