It is one report and based on several hours of reading. It flies in the face of studies that are based on long term use, and on sleep studies that note that an active display interferes with the body's circadian rhythm. In my case, my sleep patterns had a near miraculous improvement once I stopped using any device - TV, computer, tablet - for a couple of hours before sleep. As someone who had a decade of insomnia and a diagnosis of narcolepsy I was very happy to learn the cause. There are currently a huge number of studies devoted to sleep disorders among young children that point toward use of tablets, computers and phones.
Nope, I will take no notice of a single, not very well considered study that is unsupported by peer studies.