Meaning will always escape us when it comes to language.
Not only will there always be a disconnect between the speaker and his or her audience, there will always be a subjective perspective that cannot be tapped into. Can AI ever really be compared to a subjective perspective?
Although the article recognizes that perfection has not been assumed, parity might not even be a capacity.
Conversation is difficult to measure. Take a look at the philosophical viewpoint of Deconstruction. Food for thought.