Missing declaration of 'sut" in scenario creation tutorial

In the scenario creation tutorial, there is an example that mentions a 'sut' variable (contains sut.vehicle). However, there is no explanation what sut is or how/where it was declared. This is confusing, especially when this tutorial is someone's first interaction with the language.

Perhaps it should be declared together with the other vehicles (in Code 1. Actors within a cut-out scenario).