Michio Kaku also used the words “alarming” and “terrifying”, and he was much less sedate when he did. His series of videos on 3i are very urgent and emotional by comparison to Cox. You can see the competing notions to be urgent and explicit, and to be calm so as not to alarm
To alarm or not to alarm, that is the question. Cox is explicit here why he is alarmed. We have been observed long before we observe. This reminds of the prologue at the beginning of H. G. Wells’ War of the Worlds:
“No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man's and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a microscope might scrutinise the transient creatures that swarm and multiply in a drop of water. With infinite complacency men went to and fro over this globe about their little affairs, serene in their assurance of their empire over matter. It is possible that the infusoria under the microscope do the same.”