Things changed in recent years.......the club opened an internet window if you qualified as a cityzen card member.....I have no idea how this chap managed to get to a brand new seasoncard purchase via the website when its a definite window they only let you access with your supporter number and cityzen card membership. That window closes in minutes due to limited availability. Loads have been disappointed in recent years. Unless he used that same window and was lucky.
I just Googled and it seems that about the time he got his sc there was a transition from a waiting list system to a window system for Cityzens like you describe. The transition allowed for a priority for people waiting on the former system so it could be he was included in this or whoever he dealt with wasn’t that assiduous in processing the application.
I wouldn't get your blood pressure up mate! I think when you speak to the ticket office they'll confirm that the window system is the only way to get a sc.