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No, an AI's output can still violate copyright.

Not a lawyer, but I'd expect that decompilation creates a derived work which is still subject to the copyright of the original.

If you engineer a clean room process, it does not. Already proven with an open source project that went from GPL to MIT via clean room (chardet).

Exactly this. Using an LLM to study the decompiled output then another LLM to implement an emulator/engine/etc

That sounds similar to how LLMs have been trained on GPL code and yet output is not (yet) considered derivative work

Im not sure it’s really a copyright issue here, and not patent or trademark related, or something else. Copyright is really only one aspect of IP laws and they all have their own legal nuances

Definitely not clean room, quite the opposite.

“That doesn't give you copyright, but it does give you liability for the content.”