Actually, the title doesn't make that claim either. It just mentions "incompetents think they're awesome," without claiming that they're
more confident than competent people.
If you have to boil the paper down to a handful or words, this title isn't bad. It highlights the interesting bit, which will help people who've heard about Dunning-Kruger remember it. And if the reader is familiar with the misrepresentation of Dunning-Kruger, they'll learn something by reading the article.
(You did read the article, right? It specifically mentions this misconception. Key sentence: 'The findings of Dunning and Kruger are being reduced to "Stupid people are so stupid that they don't know they are stupid."' And since you read the article, the title did it's job.)