It is. It is a thorough study of the necessary components of real human dialogue, and a well-defended claim that there is no model, nor even any existing TYPE of model, which can model human dialogue. Human dialogue, the paper says, is a temporal process, and the two mathematical models for such processes--differential and stochastic--are insufficient.

From the paper: "For example, it is not conceivable that we could create a mathematical model that would enable the computation of the appropriate interpretation of interrupted statements, or of statements made by people who are talking over each other, or of the appropriate length of a pause in a conversation, which may depend on context (remembrance dinner or cocktail party), on emotional loading of the situation, on knowledge of the other person’s social standing or dialogue history, or on what the other person is doing – perhaps looking at his phone – when the conversation pauses."

Optimists in the comments here have hope for advances in mathematics that would give us a new method for modeling that could be applied. Maybe their hope isn't unfounded. I'm just a dude who read an academic paper. But I did enjoy it.