The last census fell during lockdown, which may make that a little more accurate than usual. I had not been on a census as an adult prior, my house was always empty on "census night".
The shortage may be on areas of high competition for accommodation.
Around here there is a lot of empty apartments along the waterfront. A few friends of mine that live in there propose that their neighbours are generally older and wealthy people spending most of their spare time on vacation, mostly overseas or cruise.