I mean he probably could hear it, and I hope no one on HN who heard their neighbour would bring it up on the street !
We do not have secrecy. We have privacy which is merely the politeness of our neighbours (which is of course a social construct of behaviour).
The internet has given new spaces that have not yet had the time for us to learn such behaviours. What will help us is making the internet more like our daily lives. No anonymity, etc.
But people somehow think the internet should be different - it’s not and it’s better - if we think our lives should be more free then politics is the pave for that not the router.