Jerome, with the upmost respect, there is no end of bad advice and misinformation on the net, rather than getting your knickers in a twist over it, just ignore it like most people do.
Anyone can start a blog and set up a Youtube channel and call themselves an expert on a subject of their choosing, and those that choose to follow his advice, will rapidly abandon it if their laundry starts coming out manky.
Anyway, I've seen far worse advice on laundry, and then there's alternative detergent products like soap nuts and laundry Ecoeggs sold in some supermarkets, that are supposed to last 70 washes. Ecoeggs have got to be the worst possible system for dispensing a mild detergent into a washing machine.
Mel.