I believe they were intended to be two separate axes: stupid<->clever and lazy<->industrious. This lends itself to the four quadrants referenced in the quote: clever-industrious, stupid-lazy, clever-lazy, and the infamous stupid-industrious
The old urban legend of the sysadmin who wrote scripts to send an SMS to his wife depending on whether he still had active ssh connections at 6pm comes to mind.
Others might call this being efficient or work smart, not hard etc. etc.
To me, it's quintessential laziness at its most glorious.