I'm going to chip in here with personal experience. We applied inland, not sure if that changes things as OP is outland.
We submitted inland after civil (legal) ceremony. One year later, while waiting for PR, we had a wedding ceremony. We did not notify CIC.
But, we did get a spousal interview, after receiving AIP (not sure what the outland term is). I'm not sure whether this spousal interview was a relationship interview or QA interview because they didn't split us up to ask all those personal questions. Though, she did ask us why we didn't wait to submit application till the wedding ceremony (fair question). The interview was overall positive, as we got AIP (again!) 30 minutes after via email and DM less a month later.
It is not misrepresentation to NOT report a wedding.