I believe you already learned the difference between 7時まで起きている and 7時に起きる. つもり doesn't change this difference. That's why 起きている is used there, not 起きる.
~た/~ている is not a necessary condition for that meaning. It's OK to use "A Handbook of Japanese Grammar Patterns for Teachers and Learners" as a reference book, but I don't recommend using it as a textbook. It doesn't contain detailed explanations, so it often confuses learners as a result.