If you read the article, that's not what they say at all.
They say there's insufficient evidence to believe in them. Not enough evidence is very different from no evidence.
You're right. As far as this article goes, anyway.
But consider the last sentence: "Given the lack of scientific evidence, the authors argue that the currently widespread use of learning-style tests and teaching tools is a wasteful use of limited educational resources."
THAT is a reasonable conclusion, given the constraints of institutional schooling. I especially agree with the part about learning-style *tests*, since, if it's not obvious, it's probably not that important at the classroom level.
However, that's totally different from what the headline and lede of the article said.