But the Church's attitude is that it's not private revelation, it's a forgery.
Of course the prophecy of Malachy is a fake.
It is written in the Book of Deuteronomy by Moses Ch. 18 vs. 10-12 KJV
10. There shall NOT be found among you any one that maketh his son or his daughter to pass through the fire, or that useh divination, or an observer of times, or an enchanger, or a witch,
11 Or a charmer, or a consulter wih familiar spirits, or a wizard, or a necromancer.
12. For all that do these things are an abdomination unto the Lord.