These things are not binding on other Catholics and Christians. Further, there might be a need for a serious discernment of spirits. Those who repudiate the communion of the saints often miss the various distinctions. Nor does the Almighty think very highly as to whom the RCC Beautifies. Well, there you have it.
Catholic popes canonize holy men and women as saints worthy of imitation and association.
POPE Nicholas canonizes, with his dubious authority, those who are confirmed sinners. I would say that he damns them, but like his associate Lou, he does not believe in the immortal soul. Nicholas condemns them to eternal slumber, or better yet, absolute oblivion. Some religious theorists, not Catholics mind you, would say that the dead exist but are not conscious until the final reckoning. No matter that it defies the divine economy and has God annihilating that which he created, natural reason has no real role to play in the question for them.