I don't understand why would you need to read a physical book to show them you can be entertained without an electronic device (doesn't playing with them already show that?), nor why would the whole family need to take a "timeout" from electronics so that you can tell him he can't use the devices.

I agree that physical books are best for children, and I certainly give physical copies to my younger brothers, but the reasons for the parent to read physical books seem specious.