From that article:

>Imagine Keynes was really a highlander and was still alive and at the height of his intellectual powers. Who would it be more beneficial to read, the 1936 Keynes or the 2010 Keynes?

The "at the height of his intellectual powers" is sort of begging the question.

Imagine Paul McCartney was still alive and active. Who would it be more beneficial to listen to, the 1967 McCartney of The Beatles, or the 2018 McCartney?