WG uses UDP, so as long as your firewall is configured correctly it should be impossible to scan the open port. Any packet hitting the open port that isn’t valid or doesn’t have a valid key is just dropped, same as any ports that are closed.
Most modern firewalls default to dropping packets, so you won’t be showing up in scans even with an open WG port.
I can kind of see where he’s coming from, but only if you’re weighing it against an assumed future where we’re going to die out tomorrow. That’s a low bar for hopeful, and certainly not “100% positive”.
I have a hard time seeing I Have No Mouth and I Must Scream or even worse, All Tomorrows, as “hopeful”. I’d honestly rather just die.
Plus, not all sci-fi involves humans, and not all sci-fi is in the future. There’s scifi with no humans in it, there’s scifi set in the past or in an alternate present, and none of those qualify as “hopeful by default” in the way he defines it any more than any other fiction does.