The professor's value was/is in being one of a few people with the capability of interpreting the shorthand. By translating it with AI, his value as an interpreter begins evaporating as the translated workbooks become accessible to more logicians.
He might see his value in his role of carrying the knowledge itself rather than being its gatekeeper.
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And he didn't want to milk that for the rest of his life because he's a smart guy that has other skills and interests