my 9.7" first gen pro has the exact same purple haze at that viewing angle. so does my 2018 MacBook Pro. interestingly, my iPhone 7 doesn't colour shift and looks like your air 2. is it potentially a consequence of whatever changes they made to support True Tone and P3 wide colour? maybe its just coincidence?
the mitigating factor is that the colour shifting is pretty specific to viewing from the diagonal off axis, which isn't exactly an ideal viewing angle to begin with. normal angles for me at least still look fine.