Yes, that's what it sounded like to me when I heard his

press conference on Sunday while doing dishes.

Yes, it is presumptuous and incorrect from a Catholic perspective. I've seen a number of persuasive arguments against "Once saved, always saved" which include using New Testament passages against it. For example: "“Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven." (From the Gospel of St. Matthew). There are various other passages which could be used.

Jimmy Akin has one piece on this topic which I have linked below.

Click here for link at https://jimmyakin.com/2017/03/answering-arguments-for-eterna