Is this against the principle of flap design?

Authors

This is just a picture from the internet. I was wondering if this kind of flap may decrease the blood supply of the gingival tissue coronal to the incision line? Is it against the principle of flap design? Is it a normal or recommended flap design for apicoectomies? I also assume it is hard to suture to the stable attached mucosa. Or do you prefer to make the incision for apicoectomies apical to the bony defect?