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He is talking about a different point than Baumol is famous for which is the cost of reproduction and distribution of a perfect copy of the original approaches zero. This increases returns from education and increases demand, but outcomes reflect a Pareto distribution.
The key limiting factor in technology reducing the cost of education is that learning requires individually tailored feedback loops. Education is hard to scale. Progress is being made but there is a long way to go to replicate the skills of a skilled tutor or teacher one-on-one.
In terms of music performances, which of course isn't the same as teaching, "We live in Extremistan, where black swans proliferate, winners tend to take all and the rest get nothing –there’s Domingo and a thousand opera singers working in Starbucks.” google.com/amp/s/25iq.com…
