Yea, in this thread.
EDIT: Though, reading the thread again…
It never actually says the PATCH is in 2020. It just says the new raiding/content tier. I think MMO-Champion and Wowhead may have misunderstood the post. Ahead of the Curve doesn’t go away until the new raid releases.
The fact the post ends saying they’ll have more information on the new content patch in the coming weeks adds further credence the patch may actually be in December as well.
EDIT2: The fact Dottie is confirmed as being in December, but was added to the PTR and not live further leads credence to 8.3 being in December.