Every time people talk about "Blue light" it's a problem precisely because it's like the light we get from the sun, it mucks up our circadian rhythm and keeps us awake. Or it's bad for our eyes because reasons, even though "there is no good evidence that filtering blue light with spectacles has any effect on eye health, eye strain, sleep quality or vision quality" (Wikipedia).

So if tablets do the same thing the sun does and keep us awake, that must mean kids in very sunny areas have early puberty as well? Those up in the tropics with a consistently large amount of sun year round, for example?

Even simple logic deduction, this story makes no sense. And when the truth comes out, it'll probably be something like "Exposing rats to the equivalent of 20 suns worth of blue light causes early puberty and death"