This is kind of like the post quantum encryption debate-- the technology for that attack isn't there yet. That blue airframe showed in the video looks like a Tinywhoop air65. They sell for about $100 and they fit in your hand. Even it's camera would have a hard time reading a seedphrase. Their prop blades are noisy indoors and their cameras don't see details clearly. I had one of those before flying it into the sun and losing it in the woods (I was flying only line-of-sight). Shrink that camera to fit on a fly sized craft and I think it's ability to read text goes down, not up.