I don’t know about that specific software, but I would be surprised if it decoded message bodies, which is entirely unrelated to TLS termination and shouldd be entirely unrelated to routing. So I would expect you would still be vulnerable.
Your two sentences basically contradict one another, no? Apache doesn't handle brotli, so it will pass the compressed body to the underlying server undecoded, which means the underlying server is effectively exposed to attacks on this bug, if it does brotli decode on the body.