Who is that one man that you are talking about though? Well, if you had bought bitcoin when it was around 1$, you are definitely rich by now. Also, there's nothing wrong with people wishing what they could've done in the past, it's called hindsight.
You have misunderstood the meaning of the post, lol, the op is not referring to one man but the very many people who always wish and never make a move, if you read correctly he never said he bought at $1, between the op is right, many will always say they would have bought when price was down but even when an opportunity is in front of them they still won't take advantage.