That’s incorrect.
Someone might be not breathing for a number of reasons. Most likely however, when you find them unconscious & not breathing on the street it’s for cardiac reasons. And then a defibrillator is the one best treatment for that (if the heart has a shockable rhythm that is).
Gosh, I have that recurring theme that I want/need to call 112 (European 911) but mistype every time… Three digits. But I will fail every time.