That is very sad if what the rav said is true. It doesn’t say a lot for mankind if we would all get divorced “cuz he told us to.”
But you can’t judge when you don’t know the situation and all the nuances. What you see is someone advising a divorce and the couple getting divorced. What you don’t see is all the pain that led up to it.
What I think is, someone supporting the divorce motivates the couple to get the divorce, but they clearly wanted to in the first place, because if they didn’t, they would still be married.