I already read the article, it says you must go through the whitepaper of the project.
This is the step where not everyone does. Peoples often to skip the whitepaper, but with reading the whitepaper
actually you can find the project is scam or not. Creating whitepaper need some time and cost to pay writers, scam project usually plagiarize other project's whitepaper to eliminate the cost.
So, checking whitepaper is good to identify a project.