The article is about "touching on independence, mental health, social behavior, and even environmental awareness" just as much as not sitting on your butt inside.
It talks about car culture and social challenges. It recommends class 1 e-bikes so you still have to pedal (no throttle). Yes e-bikes are "cheating" the exercise of cycling, but teens aren't getting e-bikes to go cycling they are getting them to travel without asking somebody to drive them.
Throttle e-bikes are a bit of a menace in my area, but that's whatever. If more people can get outside and enjoy life that's a huge win.