He said yesterday he's not "doing" it at all. He's just throwing an idea out there, but not actually building it. In that case, I guess he can just use one of his companies websites.

maybe Spacex has built a hardware tech demo. They have a flexible factory.

I don't think he is - he has to put the information somewhere since he doesn't own a personal website

I admit I didn't know that either, but does that really make it worthy of being the top story on HN?

Nope. But now we've got a great dataset of users that blindly upvote stories.