You can use many obfuscation techniques and sleight of hand tricks (like those stated below) to make it very hard to superficially analyze. If you over obfuscate, you run the risk of making it unintelligible to humans. The problem becomes that conventional programming languages follow a 'predictable' structure and are created so that they can be replicated by other humans.

If that pattern is figured out, im sure it can be used to train an LLM to 'comprehend' that programming language. Think of it like designing a cipher or a puzzle; you can create a very complex cipher that is understood only by you or those you choose to share it with. But if the 'trick' is revealed, then the entire cipher is broken.