To add to this, the main ML parts, as I understand it, are for the initial unrolling of layers, and for the detection of ink vs. no-ink (the position of the 'splotches'). Both of these are trained and calibrated from human observations.

All interpretation of ink as Greek letters is done purely by human inference. This may lead to errors, especially in parts where the ink is preserved especially poorly or where the text is totally different from expectations, but it would be classic human error instead of AI hallucination.