If true, the so-called "experts" are clueless.
Humans haven't followed sunrise/sunset sleep patterns for centuries. People work all sorts of hours, they work in window-less buildings, underground, stand watches at all hours on ships and submarines, fly jets through multiple time zones, stay up all hours posting on POA, etc., etc., etc. Shifting the clocks doesn't change the amount of daylight, and the amount of daylight changes throughout the year anyway, by more than one hour. This will have zero measurable impact on "sleep and public health."
Like the old Indian once said, "Only sleep and public health experts could think that cutting one end off a blanket and sewing it onto the other end would change the size of the blanket."