The French is indestructible!
Even corny sidelines aren't enough to take Black down. I had such a game last night, and whether or not I could win is debatable as I didn't have a whole lot of time left on the clock, but the point is that the Black King isn't going down! There is no way to destroy the French!
I make no claim at perfect play by White or Black, but again, this is the human factor to chess. We are not all robots, and so whether a computer says +0.5 or -0.5 is irrelevant!
If someone really knew how to destroy the French Defense--he would not put it is a chess forum on chess.com.