Your whole statement sounds pretty judgemental to me, my friend.

I’m just saying, we don’t know all the details of the relationship with the couple. Maybe they both had very unhappy marriages, and finally found their “soul mate”. I vote for not making a statement about the situation and just go to the wedding and show love for the family. The greatest commandment is love, isn’t it? If they need judging, God will do it in His good time. Besides, this couple, they aren’t even Catholic, are they? They will never want to come into the fold if they perceive Catholics are looking down on them. And coming back to Rome would be good for this couple. So let the OP be an ambassador for the Church and not alienate them. Just my two cents!