At least in my NP program, you HAD to read the textbook in addition to reviewing powerpoints. Much of the exam material was not on the powerpoints and only in the text. You might be able to get a C on an exam by only studying powerpoints. And most grad schools
consider a C unacceptable and would send you into counseling.
Some graduate NP classes do not require a textbooks, but have required readings pulled from journal articles. Other classes will require a textbook AND reading required articles. However, you can ask your instructor if you have to read all the articles - some of them will turn out to be optional.
An NP program leads to a graduate degree. In grad school, you are expected to be able to read A LOT of scholarly material and also to write in a scholarly manner. You will have to write a lot of research papers, which will require reading scholarly journal articles - a lot of them. That material will not be on any powerpoint.
As an NP, you will be expected to regularly read the professional literature. None of those journals publish articles in powerpoint format.
Bluntly, in my opinion, if you can't read a textbook or scholarly journal article, then you can't get through NP school, nor can you be a competent professional. If you don't want to read, then choose another career path in nursing.