Yes, I hold my hands up, I am a grammer and puntucation purist although don't admit to always knowing the correct way...BUT I would CHECK my punctuation and spelling if I was in publishing! (or indeed making any notice/announcement in the public eye) No wonder our poor kids get it wrong when they see things published incorrectly.
www.prima.co.uk/leisure/a36369/selfridges-has-revealed-its-christmas-window/
(..and for those who don't want to click the link it reads:
"Selfridges has revealed it's Christmas window")
Rule 1: When you mean it is or it has, use an apostrophe.
Rule 2: When you are using its as a possessive, don’t use the apostrophe.
(data.grammarbook.com/blog/pronouns/1-grammar-error/)
I teach in a post 16 college and a lot of the students get this so mixed up....no wonder if they read it articles written by people who use it incorrectly! Grrrrrrrr!!