I don’t understand the point of this article, of course you have to rinse soapy laundry with fresh water!!! What are you going to do, NOT rinse your laundry? LOL
The point is that you don’t have to beat your clothes to death in a wash cycle for 30 minutes. Try reading it again.
Apparently that is what they did...from the article.
Rinse cycle: the top row shows fabric that is rinsed in fresh water, while the bottom row was rinsed in a detergent solution
They’d rather talk about the rinse, than the lousy soap, less efficient washers, and insanely low water amounts people are forced/encouraged to use now to try to clean their clothes.