Normally, and I hope Honda is not playing marketing tricks, downforce is positive pressure on the car at a certain speed. If you speak of downforce you don't mean reduced lift.Please explain what you think is the difference between reducing lift and producing down force...lol
The car produces lift. Down force from the wing reduces that lift. Any wing/spoiler that reduces lift us producing down force.
Let's say a car has a lift of 50 lbs at 100 mph at the rear axle, you can add a Spoiler to reduce the lift to, let's say 20 lbs at 100 mph to make the car more stable at higher speeds. That would be reduced lift.
If speaking of downforce you have no lift at all, but you will need either a relatively steep spoiler which most likely will not be street legal (as the BMW M4 CSL Spoiler in its steep position) or a wing like Honda uses.
So the number of x lbs downforce at y mph should not display the number of lbs the lift is reduced but the actual number of positive pressure which is generated.
Like I said in the beginning, I sincerely hope Honda is not playing marketing tricks, stating the CTR wing produces those 66 lbs at 125 mph is real downforce and not the reduction of the lift.