I think either they changed it or there's some A/B testing thing going on. For me too, the title is "The age of dumb phones is here".
(I think the "question" version of the title is correctly answered by Betteridge's Law, and the "statement" version is wrong if it's understood as claiming that a lot of people are choosing dumb phones.)
Just to be clear, the article text title for me is "The age of dumb phones is here" but the pages title is "Is America Headed for an Age of Dumb Phones?"