No the discussion was about the effect of airfoils until you posted:
Keep in mind that dihedral will have as much or more to do with holding a plane inverted as the airfoil does.
I stated:
Dihedral make no difference as to whether or not you can fly a model inverted.
I made no reference to the degree of difficulty or the skill level required. But it is a very low bar.
Now if we were discussing free flight models, you might have a point though the effects of dihedral and the effects of the airfoil are completely different. But with radio control (as in this is a RC forum), you are grasping at straw.