Well, it doesn’t seem fair to put the litmus test on english. Why not on spanish? It would be easier for me 😆 And a chinese could put it really hard for both of us. And an alien could make all of us like a chimpanzee
may not be easy but if you were stuck in china youd be able to learn it, a cat couldnt.
We can’t use human rules to measure other animals, it has to be something more neutral.
We arent using human rules, we are using objective general rules. We can understand the vocalizations of most animals well enough to know their not symbolic in nature, and we know they cant understand us. The rules are bidirectional.
A super advanced alien could understand our language, we may be incapable of understanding theirs. but the point is one of us (the more advanced one) can understand the other.