I never checked to see if I could print but if the club are saying it's not available, anyone that has printed themselves those QR codes won't scan and there will be chaos at the turnstiles. My brother is collecting mine tomorrow as he has a day off but it's a pain in this day and age to have to physically go and collect (although you get a nicer looking ticket)!
When and where did the club say you can't print at home? I've always done it that way without any problems but as I'm a season ticket holder I only need to do it for cup games.