[throw_a_grenade]

This is honeypot. The author, https://en.wikipedia.org/wiki/John_R._Levine, keeps it just to notice any new (significant) scraping operation launched that will invariably hit his little farm and let be seen in the logs. He's well known anti-spam operative with his various efforts now dating back multiple decades.

Notice how he casually drops a link to the landing page in the NANOG message. That's how the bots will get a bait.