As I understand it, the issue is not just whether or not the person was physically IN Canada for the period before they became a PR, but whether the person was IN STATUS in Canada for those days AND whether IRCC can verify that the person was in status.
And it may be that it gets delayed while they check, or if they can't determine status from the records, that they will decide it's not sufficient days.
That's why others are saying you MIGHT want to wait and submit applicatoin until there are sufficient "full days" (that is, days after becoming a PR).
Up to you.