So I'm doing keyword research and I came across a review niche site. Nothing out of the ordinary, until the end. The guy types "Related Search Terms", and then underneath there is a list of 15 keywords he wants to rank for that are related, which he never mentions in the article. For example Dust Devil 245 Review, Best 245 Vacuum, Best 245 Dust Devil, etc. I checked and he's ranked top 5 for all of them. Found an identical site which looks like is made by the same guy, same exact thing. Is this a good idea? Do a quick keyword planner scrape of the product and plug the keywords at the end of an article that way?