Individual humans aren’t, but we’re talking about the emergent properties of a swarm of humans. 6 gigabytes of dna describes an entity that, if copied 60 times and dropped on an island, will produce a viable language in inly a few decades. We haven’t found a NN architecture with this property for language, but we have for , eg, chess, starcraft, and go
This might be too overarching of a statement but "kind" learning environments like games that have set rules and win conditions are very far from the turing completeness of human language.
