He is not a manufacturer, just a guy with a youtube channel who made up his own formula through experimentation. If you as a professional see strange steps in his procedure it is likely because he is just an average guy using off the shelf components from stores using a less than rigorous scientific method to put it together.
Most of your questions where also answered in the video, tbh it looks to me like you seem to be attacking this guy and trying to make it sounds like there's something fishy going on here. I would reconsider such a strategy, it never works and always backfires.