The 1k resistor is in the wrong place. It needs to be between the battery positive and the touch probe. It does nothing where it's located in the diagram and I believe the intent is to protect the battery from short circuits. That can happen with the circuit as shown if the positive touch probe is inadvertently contacted to a grounded metal chassis. Such as the case if the mod is in your pocket with loose change or keys.
Another issue with this circuit is the potential for ESD damage. That MOSFET is not protected. A protected MOSFET should be used since the gate terminal is highly susceptable to damage by ESD (electrostatic discharge). They can get damaged quite easily by simply touching the gate terminal when left floating like that. It doesn't even have to be enough to feel a shock. A protected MOSFET has TVS diodes built-in between the gate and source, but you can add an external TVS diode to do the same job if you want to use an unprotected FET.