The images do load from a different domain (tylervigentest.com), but that is for a different reason. I was overwhelming my webhost with more DNS requests than it could handle.[0] I went to move my domain, but it got locked in the process (I don't know why). Offloading the images was the only way I could think to reduce the strain on the current DNS server.
[0]See, for example, the comments section of the submission here a few days ago: https://news.ycombinator.com/item?id=37318295