After reading the article, I come away with the understanding that it says that cold water washing may not be appropriate for some situations. I do not see a blanket statement on cold or hot water washing. When I was in college, I can remember guys first doing their own laundry and they liked the idea of washing everything together in cold as a way to minimize the chances of color transfer and ruining their clothes. No sorting necessary! It was a simple thing they could understand and they didn't want to invest any more thought into the laundry process. They didn't care about dingy socks or undershirts.
I think that there is not a one-size-fits-all approach that is best for all laundry situations. I wash in hot, warm, and cold temps, and use different products for different situations. I don't use bleach for my dark clothes, and don't wash my underwear in cold water, for example. I understand that there are places in the world where people only wash I cold, but I would bet that they have their own "good laundry" practices which may include proper sorting, soaking, a sunny environment where they can hang out the clothes to dry, methods to kill germs in contaminated clothing, or otherwise adjust their laundry process to ensure they don't get sick. It makes more sense to me that the cautionary tale being put forth is for people who don't realize that washing underwear with cloth napkins in cold water is not a good idea, or that washing in cold all the time without taking proper precautions could lead to cross contamination.
I like to wash my towels in hot and to use bleach. But I also hang my towel on a bar to quickly dry after a shower, and can use it for several days without it developing an odor. I have used towels at other people's homes that have an odor in "clean" towels. That means to me that it was not properly washed, dried, or stored. Some people may wash their towels in warm and change their towels after each use, and that may work well for them. But I would think using a towel repeatedly, not letting the damp towel dry after use, and then washing in cold water would allow bacteria to grow in the towel, and would result in a smelly towel.
If I had to wash for a week or two in only cold water, I would be sure to carefully sort my laundry, use bleach to disinfect when necessary, and I wouldn't wash underwear with cloth napkins together.