Indirectly, yes. The actual seat height shouldn't move (would probably be negligible if it does), however, it would stiffen your suspension so the bike doesnt end up dropping a couple of inches when you actually sit on it (putting all your weight down).
I say you may want to stiffen the suspension cause for two reasons. you don't want the rear to be too low when you actually sit on because it'll affect your turning ability (general rule, higher the rear in comparison to the front, the easier it is to turn). And when you hit a bump, you don't wanna be bouncing all over the place (think pogo stick).
But everyone is different so I say you play with the adjustment to your liking.
