Very true, and he is thus a “hero” in the eyes of the survivors, and everyone else eventually. But exactly what he did was unclear to them. I can’t think of anyone who would know that he went to Xen and survived, I mean. That he did something is apparent, but what he did is unclear, and what happened to him as well.
Two factions: The G-Man and the Vortigaunts.
Did you even read his post or just see the words G-Man and TV?
@ CTID : I’d recognised that he interrupted the man, but I hadn’t thought that he was about to reveal something. It might have just been that the vort was so excited upon seeing Freeman. It wouldn’t really make sense that the man was about to say something that he wasn’t supposed to.
tbh I would have preferred it if you started in your HEV suit…even though it wouldn’t make sense(seeing as how the mark V has better protection against bullets,etc.) it would be cool to hear people say stuff like ‘What the hell is that?’ or ‘is that some kind of CP?’. I know it would mess everything up, I just think it would be cool. 
The Vorts know, and could have told humans about it.