They appear to be solderfree:
But you probably need a solder iron to get this project going.
Had a look at the second video now.
I would use an ESP with ESP-Home to control the potentiometer.
You can probably also use the shelly, but it would need to be flashed with ESP-Home and I’m not sure if there are pins that is available to control the potentiometer. I don’t have any of those.
But an ESP is cheap and easy to install.