the hard part to see is that he's using a "spring pin", somthing like this
https://www.searspartsdirect.com/pa...m_medium=cse&utm_term=2816001SM&sid=SPDxGPROD on the hub of the gear to "stop the motor". I had to watch the video a number of times to see it.
The "non coin" switch is designed to "stop" the motor at one particular spot. The "coin switch" shorts the "stop switch" momentarily thus causing the motor to move in the stopped position.
Although it works, it's not really "robust". I did a "similar" thing with 4 positions and position indication using a 24 VAC synchronous motor. A roller microswitch ran on the circumference with a "notch" at each position.
The "computer" knew when the motor "was moving/stopped" and there were two hall effect sensors with appropriate magnets in a binary pattern that read out the position.
A 24 VAC geared synchronous motor is a real good way to go. I've personally used the series 49 here:
https://www.hurst-motors.com/permanentmagnetacsynchronous.html
This was mot likely built with surplus parts. In this implementation, the microswitch has to handle the motor current.
So, a blank gear with a notch and a roller micro-switch would be a more robust sensor. A geared synchronous motor would be a superb drive.
But, there will be some fine line where the system will work. Pulsing the coin switch for a finite amount of time would be the way to go.
It probably does have some safety aspects to be aware of: e.g fingers, jamming
Some mechanisms can be moved by hand.