THIS is the phone everyone who bought the X-S-R-11-Pro-Max wishes they got instead. Considering Cook's track record with chassis redesigns, I doubt we'll see it coming earlier than 2021. Also, mr Geskin is a known for his brazen twitter attention hunting (don't want to use another verb).
I don't think they'll wait until 2021. They basically did all this with the late 2018 iPad Pro, and they've surely been working on shrinking it and applying it to the iphone. And the return to flat sidewalls gives them a little extra room to make that feasible. 2020 launch is two years after we saw it first in the iPad.