That's a bizarre claim, confidently stated.
Of course I can make a fire, cook and my own food. You can, too. When it comes to hunting, skinning and the cutting of animals, that takes a bit more practice but anyone can manage something even if the result isn't pretty.
If stores ran out of food we would have devastating problems but because of specialization, just because we live in cities now you simply can't go out hunting even if you wanted to. Plus there is probably much more pressing problems to take care of, such as the lack of water and fuel.
If most people actually couldn't cook their own food, should they need, that would be a huge problem. Which makes the comparison with IT apt.
They're not saying people can't learn those things either, but that's the practice you're talking about here. The real question is, can you learn to do it before you starve or freeze to death? Or perhaps poison yourself because you ate something you shouldn't or cooked it badly.
We already don't know how everything works, AI is steering us towards a destination where there is more of the everything.
I would also add it's also possible it will reduce the number people that are _capable_ of understanding the parts it is responsible for.