Now, there are lots of other ways to do SEO, but this approach involves making lots of sites on the Internet, trying to make them look like real/popular/official sites, and then have them all link to a site (or sites) ... that you are trying to get to rank higher in Google.
In this case, "The Prompting Company" is a little more overt (most of these SEO farms try to make their different sites look completely independent), but it seems follow the same basic pattern. With a tool like AHrefs (which is expensive so I don't have a subscription) I bet you could see their SEO, and what site they are really promoting, clearly.