"He found a few dozen ink strokes - and some complete letters - that could be labeled and used as training data.

Before long, the model was unveiling traces of crackle invisible to his own eye. Soon, these traces began to form letters and hints of actual words."

This does not sound like a "Large Language Model (LLM)" or other large set of training data, like the sort hyped by so-called "tech" companies; this sounds relatively small. What am I missing. (Besides brain cells.)