I just had a look on Ahrefs, and yes it seems he's using some crappy blog comment spam with Xrumer/GSA, but he also has a few powerful backlinks: https://en.wikipedia.org/wiki/Camel_case https://timely.is/

Also note, this guy could be using PBN's, most people who build PBN block the SEO tools(Ahrefs, Majestic, SEMRush, Moz) spider user agents for looking at their site.

Also, he only has 585 referring domains compared to 748k backlinks, so the majority of his backlinks are sitewide backlinks.