The author appears to think philosophy = ancient philosophy. There's lots of great and insightful modern philosophy. I recommend Nick Bostrom, Marcus Hutter and even that one paper from Scott Aaronson (if one is interested in comp-sci related philosophy).
I would even say if you simply consider it as literally "love of wisdom", you would be hard pressed to find anything that's remotely decent and skillfull which doesn't also contain philosophy.
