Unless "Cylinder Deactivation" is being completely deleted and Mazda is not saying anything.
Let's face it, vehicle manufacturers have done much worse in recent times. Does VW sound familiar?.
It's all about the bottom line, even if a few lives have to be lost in the process.
There is no reason to trust big business. They are not our "Friends".
I doubt Mazda disabled CD. That would violate emission footprint they already filed for and the advertised mpg on the window sticker. The mpg difference as some had noticed after the PCM update is more than the difference between CD and no CD. As a reminder:
2017 CX-5 FWD with no CD.....mpg=24/31(city/hwy)
2019 CX-5 FWD with CD.....mpg=25/31