And if the browser "404'd", that means there's actually a web server listening (different to connection refused/timed out error messages). So was it a 404 or something else but you don't understand HTTP so you just called it 404?

From the writing my impression is this is a guy flexing his "I know tech" muscles. Calling it "pwn"? Talking about his Librem phone/desktop? Well done 1337 hacker! /s