Well, the whole blog design is very gray-area 'theft' of Medium's design.
1. top-left square logo, dark gray, slab serif, fixed on scroll
3. bold, large sans-serif title in "off-black"
4. large serif body text with extended line-height
5. 100% width image on top
Despite the visual simplicity, there are a lot of variables in effect. It's definitely "inspired" by Medium.(medium has a few different post layouts, but they share the same spirit: https://medium.com/lift-and-drag/5f803f1482e3 vs https://medium.com/lift-and-drag/51691e99279f)
The logo and typography seem very similar, even to my untrained eye, though.