[comis]

It sounds like the vendor is lazy and relatively bad at SEO, but mass-creating blog networks to build backlinks still very much works in 2019 (though its morality is up for debate).

Where it sounds like they might be messing up and potentially setting the company up to get nuked is by directly linking from their spam sites to their main site. That's a big no-no.

If you want more information you should search "tiered link-building".