Nah, it’s trying to imitate the bird and is going, “No cat here, only friend” (in terms of purpose. In reality, the cat just knows birds with y appearance come to x sound, so make x sound to make y bird maybe come, the cat doesn’t understand the mechanics, just that it works)

Cats do have limited mimicry abilities - It’s probably why there are so many videos of cats “speaking” human words - adapting that mostly unused mimicry skill to get the human’s attention with sounds it notices humans use to get the attention of other humans