When I ask a question with a mistake in it, a human will either correct that mistake or ask me questions to clarify it. Such is an essential component to real communication.
If communication is just a procedural activity where, either by wrote or by statistics, an answer is derived by algorithm from a question -- then that isnt the kind of dynamic interplay of ideas inherent to two agents coodinating with language.
What this MP understands immediately is that, in people, there is a gap between stimulus and response whereby the agent tries to build an interiror representation of the obejct of communication. And if this process fails, the person can engage in acts of communication (thinking, and inference) to fix it.
Whereas here, no such interiority is present, no model is being build as part of communication -- so there is no sense of dynamical communication between agents.
