Talking about the Tempest Attack he mentions, which he tested in other video as well, accessing the camera feed with an antenna capturing electromagnetic emissions, but he was doing it on those wireless cameras so perhaps cabled cameras are safer. I did a quick research here, and if it was analog signal it would be easier, but for HD-over-Coaxial it's more complex because they use multiple bandwidths and each model has different modulation schemes, also they have less leakage so they'd need to be really close to get it, making trying to get access to the feed from inside my property very troublesome.
Unintentionally, having second-rate equipment turned out to be a very secure option lol