Which of the following was not included in the Hotel Excellence! update?

The option indicating that no addition is specified represents the correct understanding of what was not included in the Hotel Excellence! update. This suggests that there were indeed enhancements, additions, and improvements made through the update, and that it is ineffective to identify a lack of anything specific.

The other options reflect clear updates and advancements in the training program: enhanced digital training modules provide improved resources for staff, the new video tutorial series likely aims to deliver content in a more engaging way, and the mobile training app would facilitate learning on-the-go. These all represent tangible improvements that align with modern learning trends and respond to the needs of employees in the hospitality industry, showcasing Marriott’s commitment to providing robust training. In contrast, stating "no addition specified" does not contribute to the advancements and therefore signifies what was absent in the context of the update.