If anything this is a perception move. They've structured this just like WDAS and Pixar, where an independent CCO has responsibility for creative staff (and nominally some green light authority over projects).
Iger wanted to send the message that the creatives are back in charge, in all aspects of the company. I suspect this is timed deliberately to coincide with his appearance at the
Morgan Stanley Technology, Media and Telecom Conference.
I also think that while Disney has revenue and debt issues on the DMED side, the market will look favorably on Capex investment in DPEP (the opposite of 10-15 years ago). It's clear the return is there.