They havent.

"Non-Standard Lie Angles - One of the things Cobra discovered while working with Bryson DeChambeau (and we discovered during our testing) is that despite identical lengths and weights, golfers still swing ONE Length long irons faster than ONE Length short irons. You can probably chalk it up to that mental stuff I touched on earlier, but whatever the cause, it’s real, it’s repeatable, and it absolutely has implications where lie angles are concerned. As noted above, Cobra is already using the shaft to tune launch conditions. The consequence of that is that long iron shafts will bend a bit differently than middle iron shafts and short iron shafts. The way the dynamics of shaft work, we already see progressively less toe down (more upright impact lie) as shafts get shorter and clubhead speed slows. It’s the reason why many coaches and fitters advocate for flatter lie angles in wedges.To account for differing amounts of toe down, Cobra has implemented a lie angle progression with F8 ONE. The short irons have flatter lie angles than the mid irons, and the mid irons are flatter than the long irons. That may sound strange, but keep in mind that static measurements don’t often match their dynamic equivalents. What you need to take away from this is that Cobra is tuning lie angles such that when the dynamic forces (the bending and twisting of the shaft during the swing) are applied, the lie angles at impact are more consistent through the F8 ONE set."