I have yet to see a method that can actually guarantee something. OP, something to learn: no business or method will ever generate a set (guaranteed) amount.
This CPC (cost per click) is usually given for Google text ads placed at the top of SERP when people search for this term on Google, not for Adsense clicks (which are clicks generated on banners placed on a website).
Writing a few blog posts can take a few days, but applying for adsense can be a difficult process. Here’s from Google: https://support.google.com/adsense/thread/28155463?hl=en
This statement misses one important thing: how are you going to get your customers (user acquisition)? With SEO it can take months before you rank. While with paid ads, it could cost you… $50 (as per CPC you mentioned).
More easy to say it than to done it.
If the method creator would’ve had success with this method, do you think he would want more competition and other people ranking articles in this niche?
In your (method creator) dreams buddy… in your dreams…
You are perfectly correct in not understanding because this method is not something real, is a hypothetical example.
While everything posted can be done, the success rate of actually reaching these numbers is very low.