Yes. The team just prefers one more striker who can use left foot.
I agree this is not a must. But some managers advised that player using both feet performs well. Besides, I notice commentary sometimes states that the striker changes to use left/right foot to shoot, and at that time those player with this as natural foot seems having advantages. So I feel more comfortable with one more left foot striker.
In last season, this team has 3 both feet, 1 right and 1 left foot striker. After selling Leeb, now it has 1 left & 3 right foot strikers.