That's a very low-quality article, in my opinion. It takes an entire article to show how to use a simple tool and how to fetch a list of proxies, uses Makefile when a shell script would do just fine, and exaggerates the title.
This is a hobbyists' guide to scraping under the radar. Fine at that scale but quite incomplete for anything remotely mature or wide reaching.
Do you know any professionals with exceptional experience that is being shared on their blogs? For example, if someone is interested in .NET I can recommend this one: https://www.wiktorzychla.com
A few times our website went down due to the load going >30, eventually I discovered Google was doing something funky, adding the dynamic domains to the "robot.txt" file fixed the issue. Then some other search engines / scrapers seemed to run into the same issue and started requesting hundreds of thousands of URLs per day (these pages were dynamically generated and took a moderate amount of compute power).
We eventually did have to implement basic anti-scraper rules because it was degrading the user experience.