You were required to notify the visa office about your marriage before landing. You should not have landed. Instead, you should have returned your COPR since it was issued to you when you were single and then processed the paperwork required (including medical and PCC) to add your spouse to your application. Since you landed on a COPR issued to you when you were single without formally adding your new spouse to your application, you can never sponsor your spouse for PR.
Then is there any value telling the landing officer about changes to family composition? Why do they even ask if they don't tell you all the details there?
That's the LAST chance that they can turn around (yeah fly back home) and choose not to land.
From what I have read on here, it sounds like they are not very clear in telling you this. Granted there could be language barriers and such. But they need to make this crystal clear.
