Look at the signatories. US, UK, Australia, NZ, Japan, India. I guess they finally all figured out China has a lot more to lose if the world adopts strong encryption than we have to gain if we don't adopt it.
I was lazy; it's not an about-face at all they still want their law-enforcement backdoor which is just same shit different day. They still get to be mad at Apple and Google and anyone who won't support their fishing expeditions.