Disclaimer: It turns out that his wall charger was wired incorrectly, so mains voltage was wired to the ground of the vehicle, and well the chassis is the vehicle’s ground, hence the voltage. Source. Thanks @WalkingOnEggshells@beehaw.org for the correction.
Maybe neutral and ground are reversed in this video, along with another fault.
From safety standpoint neither live or neutral can’t ever be connected to something you can touch with your hand. Phase and neutral can both kill you equally, that’s why under all current laws neutral and ground are separated.
Phase and neutral are supposed to be reversible because the current inside is alternative and flows back and forth anyway.