Yep. The linked NYT article has this weak-sounding line -

> Most other wealthy countries haven’t seen similar increases, suggesting that possible culprits like smartphones don’t tell the whole story.

- but it is so focused on telling a long-winded story that I didn't bother checking whether they'd really tried to correct for that. (My cynical guess is "no" - since if they really cared and had ruled phones out, they'd clearly say so.)