They should sue Apple for false claims.
There isn't any phone other than iPhone that loses the signal altogether by just touching one point on the phone.
Perhaps, but I'm not entirely convinced that is true. It may be, but it may also be true that other phones do have a one point weakness which isn't marked by a visual cue. It's just that no one has tested a large selection of phones to locate that one point.
Of course, I'm not sure why it matters whether a pinky can drop dB ... you can't hold a phone with just 1 finger touching the side. This is just as much of an issue as arguing all phones have a major weakness because they drop dB when wrapped in aluminum foil.