I think that the text gives a skewed view of the history of go. Whole board thinking in joseki goes back hundreds of years. To be sure, modern understanding is much better than it was back then, but it is hardly a modern development.

Still, the idea of whole board joseki, in the sense of sequences that are not confined to one area, is interesting. The distinction between it and opening is fuzzy, however.

(Later): The text has been rewritten, and now gives a more accurate and balanced view of history.