It's not bragging because he hasn't actually done it and just talking about in on HN in retrospect. You and I could say the same thing too for example, and that

It's not bragging because he hasn't actually done it and just talking about in on HN in retrospect. You and I could say the same thing too for example, and that wouldn't make us a bragger. It would however make us braggers if we actually did invest and made tons of money out of it.