You're answering a question that no one is interested in. The problem isn't "can any singular instance of an encrypted output be compressed". That's a trivial c

You're answering a question that no one is interested in. The problem isn't "can any singular instance of an encrypted output be compressed". That's a trivial conclusion -- as it's theoretically completely random bits, of course some combinations of those bits are going to be compressible, maybe even highly compressible. It might be that the encrypted output is entirely a single repeated byte, in which case a 4-gigabyte message could be compressed to 4 bytes (being the integer representing how many times to repeat the byte). The real question is, can you reliably compress encrypted messages in general? And, given that the encryption is not broken, the answer is no.