Displaying custom blocks inside Tutor LMS pages/templates

So if I am right, does this mean that I won’t be able to use GeneratePress hook system to display elements?

The message from TutorLMS suggested that for sure.

The function way they've shown is the most generic way of using hooks. You can do the same thing with any GP hooks and WP hooks as well:
https://docs.generatepress.com/article/using-hooks/