I have been told that guy on youtube is a shill..
As for the squelch, it really depends on where you are/how much RF noise there is around you, but pretty much yes, set the squelch to just above the noise-floor, and the radio will stay perfectly quite until it receives a signal. BUT, if you set it too low, and drive through an area with a lot of RF noise, you're going to hear the noise - this will happen on any radio to some extent, but it is usually less of an issue on higher quality radios.