I don't have access to info but you are right on the leak doc on DF-27 saying test flight rather than deployment. That takes away from my point on disclosing timeline.
As for DF-ZF. Neither side ever directly credited any announced or observed flights to DF-ZF in particular. There are many hypersonic programs (not all of them missiles) in China. The DF-ZF in my understanding is simply what the DF-17 is or rather became.
Speculations on timelines aside, what's your take on DF-100 propulsion? The claimed Zircon interception photos. The relation between those three (DF-100, Hyfly, Zircon) wrt their similar inlet design and overall size (assuming Zircon photos from Ukraine are showing Zircon or Russian equivalent of Hyfly).