A nuclear strike is a mission that mobilises many aircraft. The strike may involve several targets, in which case there must be a synchronization that results in simultaneous nuclear explosions so that there is no advance notice for some of them.
Such a strike must not fail, so there are many conventional aircraft destroying or neutralising the opponent's defences to facilitate the penetration of the aircraft carrying the nuclear payload. But in the end, if the opposing forces are not completely eliminated, the Rafale must penetrate to fire its missile, and it must do so at the scheduled time.
Targets can be deep in enemy territory, and that is why, despite the range of the ASMP-A, the Rafale needs a significant penetration capability.