They are talking about espresso — one small cup has more caffeine, than several cups of American coffee.
They are finally figuring out that coffee and chocolate are good for you, even eggs, after many years of telling you the opposite.
Everything in moderation is probably fine. People are different from each other, so there is no one solution for all.
A serving of espresso has less caffeine than a serving of coffee, not more. Ounce per ounce it has more caffeine, but a mug of coffee has enough volume to exceed the caffeine in a shot of espresso.
If I could afford it, I’d get an espresso machine.