I used to have old computer chess boards that played relatively well till they didn't. They would make the same blunder in a position over and over. You had to avoid that line to get a decent game. Having said that, the mistake in the games posted is tricky. If he did not analyze his game he could have figured he should not have taken with his knight without realizing he needed to prevent that position much sooner.
but i know where he is coming from. i played some people and thought they played original till i found out chessmaster had the exact same playing style. but maybe coincidence you never know.