I’m not backing the take itself, as other said it is widely extrapolation, but i don’t really understand how the fact that cats meowing only/mostly at their mom and humans would invalidate the theory that humans and cats are the same category in cats’ minds, since they use it for both cats and humans. It could indicate that they consider humans kinda like parents cats or just parents, maybe, but i don’t see how it indicates that they could consider humans as non cats.