Not so simple. Murray will see that his opponent is using that strategy sooner rather than later, and will change his approach and change his tactics.
It's not as simple as you say it is.
It's not just that it's not simple. It's suicidal.
His suggestion is that you rush the net against one of the best passers in the game. And not to his weaker side, the forehand. No, you are to rush the net and approach to the backhand, which is one of the best in the game.