Let's be clear on perspective here: I'm an M4 who curbstomped both of these exams and you are an M1 5 months into school listening to something your school told you about the makeup of the comlex and how to prioritize it without knowing the reason for my recommendation. It's not even a particularly controversial one after you get on the other side of the exams and know what they are like. It has been espoused over the years in the yearly board threads on sdn. Your perspective is based on your school's ONLY interest: no one failing comlex (note that has nothing to do with anyone doing well.) They have a vested interest not to share the full picture but that's for another thread.
Board studying is a zero-sum game. You are either board studying or you are spending time with family, doing research, or something else. Within board studying, you are either studying things pertinent for both usmle and comlex or just comlex (OMM). This means that spending more time on OMM is spending less time on topics that will help you on both exams. Most DO students find step harder for various reasons. They need more time for USMLE and most upperclassmen on sdn agree that a strong step 1 will carry you through M3. Plainly, studying for OMM for comlex is taking away time from family or more important things for your career.
As far as the actual exam, my personal exam had between 15-20% OMM questions (level 2 had 10% maybe). The important distinction is that most OMM questions are not true OMM knowledge that needs to be studied and memorized for the exam. OMM knowledge questions would be random counterstrain points that don't follow general principles, cranial, bizzare and esoteric setups etc. A theme in DO education is labeling things OMM related that just really aren't and the comlex question breakdown is no different. As
@Osteosaur alluded to earlier, the rest of the questions are just common sense from passing your OMM exams during preclinical. Traditional counterstrain, muscle energy and stuff like that is easy enough if you learned gross anatomy because it is based on simple principles.
Given that it is a multiple choice exam, statistically you will get some educated guesses correct via test taking skills even if you do not know the OMM Knowledge questions. You will get many of the incorrectly labeled OMM questions right based on passing your OMM exams during preclinical because they are general knowledge questions. There is a reason people pretty much only cram OMM for a couple days between exams. It's not because they are OMM experts. It's because it's really not a big deal despite what your school says when you look at the details. This leaves very few questions that need specific OMM studying. Even fewer are worth actually studying like the classic viscerosomatics chart (aka not cranial and counterstrain.) Are you really going to say it's controversial to punt a few questions like that?
My statement that one can ignore OMM is backed by scores to prove it. I didn't say that OP should not study OMM at all. Hell, I studied for 5ish hours. I'm saying you definitely could skip it mathematically if you study science hard enough and my point was to not worry about OMM for boards in the same way OP listed UFAPS, for example. I brought it up specifically because studying for OMM before that cram session is actively working against more important aspects of your life and education. Your data didn't highlight the importance of OMM on the comlex. It highlighted that OMM is a way to boost a score for people who should have just studied the basic sciences in the first place for their career. So yeah, I'm saying that one doesn't need to take "all" of the aspects seriously. It says a lot about your argument when your response is that I'm the one saying to "make up for it with other subjects". Let's not get it twisted. Which one of us is advocating studying science for life and both boards and which one of us is advocating studying OMM to make up for not studying science hard enough? Who is really using something to make up for the other lol? It's not the basic science subjects...
After you take level 1 (and even moreso after level 2), you will understand why it isn't a cavalier attitude. Good luck.