Of course they don't. Notice that they never say specifically that they aren't going to go outside. It isn't necessary. Inference is an important skill, but one that's often left out of elementary level textbooks since it is considered a high level of comprehension. Indeed, beginners who lack extensive vocabularies and knowledge of language functions and grammar often need to infer a lot just to compensate for what they don't understand.
Inference is neither magic nor pure imagination.
It is hearing meaning that is there, even when the words aren't. By regularly pointing out task types, teachers encourage learners to notice their own listening goals. As useful as these three types of listening are both for learner awareness and as a checklist for teachers planning classes, it's important to remember that the skills are rarely used in isolation. At times, a specific word or two will give the clues that help learners understand the gist. In some cases, global knowledge of a topic makes it easier to focus on specific information or to infer meaning.