Wreck a microwave oven or hold a video-streaming phone to your ear, either should be perceptible.
Ie “coil whine”.. not saying this guy isn’t a nut. But it is possible to hear electronic devices. On a computer streaming video the increased current demands can make power supply coils more audible.
Some people are sensitive to some frequencies.
An LCD shouldn't whine, but some can (bad capacitors, cheap power supplies, or any number of other causes).