Yes wind off - but wind is always a problem - especially for the snakeyes. But the mirage has no system to compensate the wind influence on the ordnance, so that has nothing to do with the accuracy of the system it self.
No steep dive, it was level at 800ft or something - and the bomb lands in really close vicinity of the target. If you drop at 5000ft you can watch the little parachutes drifting to nowhere. But that is, again, not a problem of the targeting system.