Yup!
In fact that detail can be traced all the way back to the Bahrain test spec W13:
The only show and tell document this year which mentioned changes to the diffuser was the one for Spain and it says
"small change to diffuser sideview profile, to allow more flow into the diffuser [...]"
My guess is that the key words "side view profile" and "into" might mean that it could be hard to spot and/or find comparison pics.