The question of meaning is a question for philosophers. Physicists deal with what they can model / explain.
They are obviously "communicating" somehow. The mechanism is simply unknown.
The mechanism is the "virtual particles". Whether those particles have physical existence is a question physicists avoid.
The best answer is that the model (i.e. the explanation for reality) matches reality.
Does this mean that the model accurately and correctly describes the underlying mechanism for communication? The best answer to that is "Yes, so far as we can tell".
Comments
The question of meaning is a question for philosophers. Physicists deal with what they can model / explain.
The mechanism is the "virtual particles". Whether those particles have physical existence is a question physicists avoid.
The best answer is that the model (i.e. the explanation for reality) matches reality.
Does this mean that the model accurately and correctly describes the underlying mechanism for communication? The best answer to that is "Yes, so far as we can tell".