The statement, "the meaning of a communication is its response", does seem to be counter intuitive.
It seems far more intuitive to expect the meaning to be included in the communication.
But if meaning were included in the communication, conversation would be impossible.
I mean why would I be having this conversation with you now, if I already knew the meaning?
No, you are an essential part of this conversation. I can't do without you. I depend on you to give my communication meaning. And of course vice versa.
And I wait on your response to see what my communication means.
So rather than asking what my communication means, you have free rein to tell me the meaning.