I agree with your 'alone' point.
For all practical purposes, this is the case. Even if 'they' were at the nearest star (and they are not), any conversation by electromagnetic means is a round trip of around 9 years.
There is no tolling bell; at least, not yet. And, we as a collective civilisation have travelled just beyond the Moon, and as electromagnetic beings have radiated, very weakly, for only around 120 years so our bubble of influence is small in stellar distances. As John Donne said....
"No man is an Iland, intire of it selfe; every man is a peece of the Continent, a part of the maine; if a Clod bee washed away by the Sea, Europe is the lesse, as well as if a Promontorie were, as well as if a Mannor of thy friends or of thine owne were; any mans death diminishes me, because I am involved in Mankinde; And therefore never send to know for whom the bell tolls; It tolls for thee." https://en.wikipedia.org/wiki/...