Accurate & concise, without being strident, bloviated & condescending.I think he was referring to the writing itself.
There is mounting evidence that humanity passed peak cognitive performance 15-20 years ago. Reading the well-written copy on 60+ year old record jackets and sleeves certainly supports the notion.
Word use & definition then also not being so "squishy" like they seem to be more often than not these days.
Easy to understand what is meant without a need to "read between the lines".