@wonderwall007 don't overthink it.
It's more for making life easier for the IRCC agent working on your case by providing an address that matches the 6 months+ single exit from the country that you'll list in the physical presence calculator. That agent will not care about the Airbnb address of that week you spent in, say, New York or that month summer vacation touring Europe, but 6 months in a row may be a different story.
Your ties with Canada are not thrown into question because you spent 6 months abroad, so just list it out of completeness.
And if you really really really don't want to do so because of tax residence and whatnot (although that's a completely different subject), and want to keep your home address in there, add a explanation letter saying that you lived at your parents place, which you'll specify, while keeping your home and ties in Canada.