There's another video on it here:
Basically boils down to having colours with zero metallic, which has been standard for 25+ years and is what our brains are used to. When you add colour selections that are essentially pastel and very dense, it looks like putty, even with a shiny clear coat applied. Non-metallic black, white, and bright colours don't show the effect, as they are already dominant and it doesn't mess with our brains to not see some reflection of ambient light like it does with the pastel shades.
The top comment is from someone in the car industry, and he basically says it's a combination of fashion and cost, as the rising cost of aluminum for metallic paint as well as the complexity of getting it consistent and even means the car companies love the 'nardo' colours as they're much cheaper while appearing premium as they're relatively novel.
There was a phase for about 5-10 years that's now starting to fade away, where every single house that had been fluffed for sale had almost no colour, had a grey wall at minimum, usually entire rooms, kitchen cabinets, etc. and everything was stark. I absolutely hated it, but according to our real estate agent, it resonated with Millennial buyers new to the market (not Gen Z, who are not yet shopping for houses and a lot fewer cars). These colours are the same. And like battleship grey kitchens (and avocado appliances, carpeted bathrooms, sunken living rooms, etc.) will soon be ditched as looking dated and too much 'of their time'...