Stating facts about this couple which are offered on Our Sunday Visitor is neither speculation nor gossip.
As far as uncharitable, it can’t get much worse than avoiding bringing children into the world.
And to think the Pope called this couple to speak about the “collapse of the traditional family”.
Nothing wrong with offering facts what is wrong is stating that these facts must be so because they are in disobedience to Church teaching. You cannot know that. But there are reasons besides contraceptive use that a couple may only have a smaller family. Neither you or I have any idea of those reasons as they are sure to be a private matter.