Yes! This means the extended battery pack could provide somewhere over 300 miles of range based upon Ford having a buffer of unavailable kWh as found in their PHEV. How much of a buffer is unknown but a CMax Energi had 15%.
I wouldn't trust anything in the rendering you're referencing. That's a generated image, most likely from canned data. Even if real data, it's just one sample and the vehicle could have been going downhill. Let's wait for EPA numbers and reviewer test drives next year.
Thanks for posting the pic. All other EV's on the market have an EPA rating of around 4 miles/kWh. So the 3.6 shown in the photo is in line with other EV's, and what I would expect on a test drive basis.