Yes, despair one of the unforgivable sins, because one gives up entirely on God. This so-called Catholic priest is saying his sins are greater than the mercy of God.
From looking at him with our human eyes, he is saying to his flock there is no God. What an example he gives to others. I can't even imagine. These are the fruits of Vatican II.
I know that we are all sinners, that is a fact. But for a Catholic priest, (meaning the world sees this person as a priest) a priest is in persona Christi. It is more than sad; it is a scandal beyond logic.
We hear so much of these actions from what is suppose to be the Church the world is getting conditioned just to accept it, and that is exactly the devil's desire. The youth of today, if it weren't for God's grace, would never have a chance for salvation.