Alexandra,
It's my understanding that ITTOs will still reveal their ugly heads in the current exam, but in a different way. PMBOK 6 used ITTOs to support implementation of various processes used in project management, while PMBOK 7 is "Principle focused." You will still need "business documents," "organizational process assets" and the like to develop a project charter.
With that, I'm not sure how much it's emphasized in the current exam. I can recall my exam (PMBOK 6-based) had only a couple of questions directly wanting ITTO information, (e.g. "What is the output of ....") but several that alluded to ITTOs. I found it easier to learn the exceptions when I was studying, rather than the entire ITTO matrix.
Other mods should comment on this one!
Harry