Not necessarily. It does follow that if you submit to a tracker, but there's the DHT option which is advertised locally [0]. The way it seems to do it is the magnet uri includes the contents of a few IPs that might have, at minimum, a more up-to-date DHT with more IPs. At best it also includes some chunks of whatever you're trying to download.
[0]: https://stackoverflow.com/questions/1332107/how-does-dht-in-...