To be pedantic, I think the issue is more with the word itself. "Debunk" implies "expose the falseness or hollowness of (a myth, idea, or belief)" which is too strong when it comes to a study, especially when it doesn't itself claim to "debunk" anything.
Maybe we could say the theory is "weakened" by the new evidence or that it is now more "controversial" than it was before. "Debunk" sounds like blue light having an impact or circadian rhythm is some random "fake news" that could be found on Facebook, when it is still backed by some decent evidence.
Debunked or not I personally haven't seen it make a difference in sleep. But it DOES make these screens much more pleasant to the eye in dusk/evening hours. I'm a fan.
Maybe we could say the theory is "weakened" by the new evidence or that it is now more "controversial" than it was before. "Debunk" sounds like blue light having an impact or circadian rhythm is some random "fake news" that could be found on Facebook, when it is still backed by some decent evidence.