Does all that training train into aggression when being an adult? I mean, does the dog learn with the target for personal protection as a threat not just a sleeve overtime?

You have to eventually work with a SKILLED decoy if you wish to bring aggression to the work. The scope of the video you just watched is simply to teach some of the mechanics the dog will need when you don’t have access to the decoy. A dog should never be taught aggression or defense with the handler, it should always come from a decoy.

If you are interested in personal protection, I’d recommend:

The First Steps of Defense
Training Personal Protection Dogs