This is a pretty interesting concept and seems to make sense. I would imagine the birds don't want to mess with something that is oddly reflective.
I have had 4 birds impact my drone. Always from behind, so I don't have any footage. But every time I held my breath, especially when above water. The last bird was a sea gull. I don't think he did it on purpose. It looked like we just happen to be on the same flight path with him behind me. I stopped my drone to take a picture and he rear ended me and then took off without providing any insurance.
So far I have not had my drone be affected aside from the viable bump on the videos.
I bought an extremely bright LED strobe light made by Fire House, and affix that tiny, self-powered module to the rear of both my drones with velcro tabs.
Thus far, I have noted several hawks swoop in for a closer look, from various trajectories, only to veer off at the last moment. My non-scientific conclusion is that the keen eyesight of the raptors is assaulted by that light, thereby neutralizing all aerial intercept plans under consideration.