This is not a weird question at all. Growing up in India, I saw cow dung used in a 100 odd ways all the time. But, I don't believe in these miracles. I am almost certain that they are touting these one-offs in an exaggerated manner, because if cow dung could produce such results, every inch of South India would be a dense tropical jungle, I assure you, sadly, opposite is the case.
Cow dung is used for all purposes - dried and caked as fuel for stoves, as a mosquito repellent when wet and sprayed, sprayed on dried to stabilize loose topsoil on walkways and such - people used it quite a bit. To Bamboo's point, in India, it gets hot enough, women, at least when I was growing up, had turned slapping rounded pancake-like patties onto the wall, that allowed it to cake in the heat and become ready for storage as fuel. One day, it will be a lost art.
To Bamboo's points, yes, when we were growing up in India, antibiotics in cows was virtually unheard of, and my family's current ownership of cows in a semi-rural setting has become quite unique. We ourselves travel 30 miles or so to get to our farm where a guy manages the cows for my mother now.
The easiest use I have seen of cow-dung, and this is probably what maybe the lady in your video is confounding, is as a rooting and seeding medium. When it is wet, and put in a container or a hole and you stick a rose cutting in it, you can actually root the rose quite successfully. I remember us doing this at home.
My mother has cows in her farm, and the tons of manure can be composted, reused and even sold off for others to use as they see fit. My garden here, in the US is potted, because I rent, and I blend steer and chicken manure into my pots with used and fresh potting soil and bits of garden soil for drainage. It works well for most general types of plants including roses.
I think the warning to not use manure in potted soil arose from the notion that most people don't know how to proportion it carefully. I have always ignored the rule, as I have grown up around this stuff and have figured out the quantities to use. But, I have seen no miracles and I am not about to put out some misleading YouTube video.
Gardening or farming success can be achieved through multiple, tried and tested means that you can consult with agricultural universities/colleges and/or master gardener groups, horticultural societies, whatever is locally available. I would ignore all the "miracle" nonsense. These things are usually not scalable, the successes being limited and breed/species specific, etc.