I mean how do I respond to that? If you are bright enough to type on the internet you are bright enough to know that flesh is electrically conductive. I have to assume you are being deliberately obtuse.
Again, if this true you could 'detune' other phones with a single finger - not a single video showing it. I again assume you are being deliberately obtuse.
Again, it seems like you are pretending you have no idea what attenuation is - if it was attenuation it wouldn't matter if the antenna was internal or external - that happens because your very much electrically conductive flesh acts as a fleshy Faraday cage, if you could touch the antenna or not that would make no significant difference IF that was the cause. That's why we know its not in this case.
Again, antenna attenuation will not happen with a single touch of a fingertip. The issues you get when you hold a phone tightly with a relatively large mass of flesh and when you can cause signal loss because of the touch of a single finger are two very different things. No matter how many times you pretend they are the same you just embarrass yourself every single time.
and again, if you would take your own advice you wouldn't be posting at all.