After some beers yesterday I had the idea, what if there's a hidden semantic layer. So their communication is not encrypted by our understanding of cryptographic methods but more like shared mechanism of building the latent space. Something in the direction we saw with knowledge transfer from a teacher to its student model where a seemingly unrelated prevalence got adopted. I mean the more we train the models by reinforced learning the farther they develop their own idioms.

...because they just read your comment. what have you done stratos123!