I think most people will be able to decipher the fact it looks like an @ sign and, at the same time, like a picture of a house, and given all the Stay at Home messaging everywhere else, it doesn’t take a genius to work out what it says - especially when it is highly likely also to have the words Stay at Home written in full somewhere else on the page.
I think it’s a way of government helping to keep the newspaper industry afloat, given the lack of other advertising revenue at the moment.
As for not touching paper for 24 hours, this solves another problem for those people who don’t like the front page: throw that advertising page away, wash your hands and then happily read your paper in the knowledge that it is unlikely that corona-virus riddled hands touched more then the front and back covers, anyway.