I have always been strongly against the census as a matter of principle. I am not against the collection of information, or the type of information collected. What I object to is the refusal to anonymise that information. How many toilets I have may be statistically relevant, but the fact they belong to me is not. It is none of your business and it is not the business of any authority.
For that reason I always make a point of travelling overseas so as not to be in the country on snapshot day or any day close to it. So how does that work with your deferred form collection?