In this context, the term "paper" is likely a colloquialism or a mislabeling of the file in the forum or site where you found it.
These files are typically found on community sites like Reddit's r/pkglinks or specialized gaming forums where users share "fake packages" (FPKGs) for homebrew-enabled consoles. Aeterna.Noctis_CUSA32236_v1.02_BACKPORT_[5.05-6...
: A challenging 2D Metroidvania game known for its high difficulty and platforming. In this context, the term "paper" is likely
: A technical modification that allows a game designed for newer PlayStation 4 firmware (like 9.00) to run on much older "jailbroken" firmware versions, such as 5.05 or 6.72. In this context