You don´t need to unsolder the LCD from the main board
to try this fix. The contacts people are talking about
are indeed the points where the ribon cable of the touchscreen
touchs the glass panel.

The problem in your remote is that the ribon showed in
your first picture, loses their contact at the point that
it touch the glass. The ribon is gluded there and after
some time this contact get lost. The ribon is a 4 way
flat and touch the glass in four points. You can try perfurate
the ribon in each contact where it touch the glass and
see if the contact is restored.

Sometimes just puting some pressure on it solved the problem.
Some guys used the expression "to clean" the contacts
but they are only making pressure on them, since the real
contact is under the ribon, betwen the ribon and the glass.
Perfurate the ribon on the 4 contact points make the conductor
cupper bends and sometimes it makes the contact touch
the glass again.