Recently I came across an interesting looking cryptography article Ring-LWE Ciphertext Compression and Error Correction: Tools for Lightweight Post-Quantum Cryptography by Markku-Juhani O. Saarinen, which specifically state
Ciphertext compression can significantly increase the probability of decryption errors.
Which I wonder now, does this indeed mean compressing the ciphertext, which I undertand isn't sensible (basically since encryption should randomize the output so it doesn't really compress after the operation) or doing the compression in the same go? Analogously to how AEAD does encryption and authentication.
I tried to gleanse something from the paper and read about this from the Internet, but being a rather layman on encryption methdos certainly doesn't help.