Naw.... Its flexing. The wing spars (both of them) are solid pieces of metal. No joints in the spars. Think of it like bending your legs when you make an impact. It certainly makes it hurt a lot less. Same principal here.
And FYI, that isn't duct tape. Its aviation-grade aluminum tape designed to do that. And even if it did fail, its only a winglet which slightly improves fuel economy and reduces a drag a little. Does almost nothing to keep the plane in the air.