@Kirin-kun
That makes total sense. They also mentioned UK's navy were "excercisesing" which obviously serve as a cover for french naval activities.
And of course the french can land on north african atlantic ports like casablanca, assuming they are part of french possesion just like irl.
Brest is like the north western tip of france facing the atlantic coast. If they are going to north africa, why dont they use mediterranian ports like marseille or toulon? Is it for deception purposes?