The author mentions various categories grew or shrank, but always in percentages. Since the list also grew from 2300 to 2800 words that feels like it might distort things a bit: in absolute word count, a category that shrank by 1% lost fewer words than a category that grew by 1% would have gained, no?

Having said that, the categories that shrank all did so by a big enough percentage to also shrink in absolute number of words, so at least that isn't a problem.