1 - I never said it is likely not to go through, I said it is a common interview question, that's all.
2 - I don't work for IRCC so I can't tell you why they request it. Applicants that I've seen get a request to upload their CV are usually postdoctoral candidates or involved in some kind of research activities, I don't know if that's the case with you.
3 - I've seen plenty of applicants who got requested to upload their CV and obtained PPR although i'm unsure as to whether they also had to provide this other form.