Node ID is missing in contextual filters
In the screenshot you show, it's Identifiant (ID), the third rown of the Contenu category (Catégorie in the screenshot).

Since the context filters have a category, the node ID is simply called Identifier or ID. There isn't any possibility to confuse it with other IDs, like the user ID, because other IDs have a different category. You cannot even confuse it with the revision ID (Identifiant (ID) de révision) or the UUID (Identifiant universel unique (UUID)).