I think this is a good time to point out the title of the study seems to be "Chronic refined carbohydrate consumption measured by glycemic load and variation in cognitive performance in healthy people", which is quite different than the title in a news article. I recommend always treating news reporting of science with a healthy level of skepticism, not driven from the assumption that the news will lie, but driven from the assumption that the news isn't written by scientists who understand the technicalities of scientific writing nor the existing body knowledge about the specific topic.
I agree it's not technically lying, but it's definitely something bad when people who know they don't know enough about something still write about it.
