Sorry, I noticed this post a little late. I usually get notifications for new posts here, but I believe I was doing maintenance on the notification server when you posted this.
Anyway, it looks like you figured this out already. I would love to include an option to toggle this account setting in Arctic, however it goes against the AppStore regulations. I’m allowed to have a toggle for client side filtering and blurring, but not for changing the account setting. I’ll see about adding a status message in settings to notify users if NSFW content is disabled on their account.