"Living near traffic noise increases your chance of stroke. Probably not the best place to be putting impressionable young people looking for connection"

This isn't about _living_ near traffic noise (which is what has been "proven by scientific research). It's about some young people doing an event for a few hours in a city setting.

The chances of young people in general having a stroke are near 0, and the concern of them having a stroke because they stayed near traffic noise for a few hours is so low and misguided, it doesn't even make sense. Might as well worry about falling pianos when standing near buildings.

It's also doubly irrelevant, as the "high traffic areas" in the story refers to pedestrian traffic, not motor traffic. Simply, they set them up where many people pass, so they can find people to shout that slogan to.