We've very specifically talking about the Fly High/Disengage rule here.
Disengage:
This model and any models in its garrison can still shoot if this model retreats in the same turn, as long as there are no enemy units that can fly within 3” of this model at the start of the retreat move and there are less than 10 wounds allocated to this model at the start of the retreat move.
Note that Fly High requires less than 7 wounds, while Disengage requires 10 wounds. So If you have 6 or fewer wounds, you can Fly High and still shoot. If you have between 7 and 9 wounds, you can disengage and still shoot, but you cannot shoot if you were next to a flyer.