"by the close proximity of an 80 per cent water human hand"
I'd be very surprised if a human hand contained 80% water. Just because a whole body does so, doesn't mean this is true for each part of it.
And just to remind you, this has nothing to do with antennagate, which was caused bu the human hand bridging the antennae who were at the outside, unprotected. Hence the 'easy' fix by isolating them with a thin rubber/silicone/... bumper.