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.
I actually got a very different impression. He could publish this interesting result, exactly because he had been working on this project i.e., had an interesting dataset to feed into Claude and had the expertise to interpret its output.
Compare him to those who are burning tokens to generate cringeworthy AI slop on social media. The value of a tool depends on the skill of the user.