That video just shows simple data connection between two modules, it has absolutely nothing to do with what you are trying to do.
You can’t just put something in the way between the transmitter and the receiver. These are radio waves they will bounce all over the place. You need an radio dead anechoic chamber to remove them. Any object less than the wavelength of the radio signal will not block the radio signal it will simply go round it. So in this case 433MHz is about two 70cm, so to make sure the radio wave goes through an object at these frequencies you will have to have the object at least a meter in both dimensions.
You simply will not get any results with what you are trying.
No, physics does not work like that, especially at those sorts of frequencies.