High traffic spam site

What i understand is that they create a lot of page of the keywords they want. Example the keyword "blackhatworld" they'll create a lot of page containing word blackhatworld like /blackhatworld-1 /blackhatworld-2 /blackhatworld-3 and on to like hundreds or thousands of them. Then all the page will be redirect to the moneysite.
No backlink, fresh domain, but still rank.

The question is could those really rank without anything else?
The main question is how they index such a large number of pages and how they create content for it there is a unique meta description for each pages that's weird without setting up site how they do this
 
Working on similar projects but creating these many pages is main issue didn't get it how they created it
 
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