DHH is the creator of Ruby On Rails. He is also a rich opinionated high energy asshole (so your average Apple fanboi). Those thumbnails are videos that explain and show the workflow of his desktop.

Seems a bit reductive when the post is literally him pushing Arch Linux and he's also been hyping Framework and talking about his Apple departure for quite a while now.

But also for GP, there's literally an "About DHH" section at the bottom of the pretty short post you're commenting on.