Well, in my last application (PGWP extension), I only mentioned about my current PGWP document. I was approved without any problems. I guess IRCC deduced that since I have a valid PGWP, then I must have an SP before. I didn’t get any PFL or misrepresentation. I think (others may correct me on this), IRCC is more concerned with not mentioning previous refusals. I may be wrong, though.