[n2d4]

This is such an odd comment.

In the thread you linked, Gwern says in response to someone else that NNs excel at many complex real-world tasks even if there are some tasks where they fail but humans (or other models) succeed. You try to counter that by bringing up an example for the latter type of task? And then try to argue that this proves Gwern wrong?

Whether they said "regular grammar" or "context-free grammar" doesn't even matter, the meaning of their message is still the exact same.