above is not falsifiable but a logical hypothesis
then its not a logical hypothesis. if it's not falsifiable, its not a hypothesis. it would be a statement of faith, if anything.
fortunately for you, it is falsifiable, because we know how the hymalans were formed--not by your screwed up geoscience.
the geological upheavel/trauma is not cause by a massive depression of the tectonic plates, but by lateral, aka horizontal, movement of the plate. i'll let the other, more geologically inclined handle the rest of the misunderstandings.