This is a valid strategy in modern fencing, since any depression of the tip with sufficient force while contacting valid target area constitutes a touch. In pre-modern fencing, judging was done by side judges, so a touch had to land and stick long enough to be reliably counted.
In modern fencing, a touch is registered when the tip of the blade makes sufficient contact with a valid target area while applying enough force. In pre-modern fencing, judges determined touches by side judges, requiring the touch to remain in contact with the target for an adequate duration before it could be counted.