Is census really accurate without holiday-makers?

In the last week I took a holiday abroad, my first trip aboard in eight years. 

Yet according to the Census of Population 2016 I don’t exist, except in the completion of a one-page form in which I fill out my name and address and the address of where I stayed abroad on the night of April 24.

I know the amount of people in a country varies constantly depending on the amount of visitors and the number of people who normally reside in the country that are abroad. But is a census really accurate if someone like myself, who has been continuously resident in the country for the previous eight years, is absent on the night of the census, is to all extents excluded?