I never heard that the seven deadly sins could not be forgiven. The Church has always taught that repentance brings forgiveness through the blood of Christ.
Keep in mind that we have the OLD testament, the EARLY Christian Church - (Nicea) and the current Catholic Church.
I have BIG issues with the current pope - He is a Commie and bad for the Church
according to the Bible these 7 deadly sins are completely and totally forgivable by God, but this doesn’t give free license to commit these sins. Biblically, the only sin that cannot be forgiven is complete rejection of God’s grace which is outright rebellion against God, also known as blasphemy against the Holy Spirit.