The parent is correct if you're not using the Developer Certificate, but relying on the Free Provisioning Profile - as the name implies, it is free, but it only lasts for 7 days instead of the 1 year you get with a paid developer account / Developer Certificate.
The advantage of the Free Profile is that (afaik) it can't be revoked or censored. Disadvantage is 7 day lifespan.
The advantage of the Free Profile is that (afaik) it can't be revoked or censored. Disadvantage is 7 day lifespan.