Without chasing your link, I assume it's the one where anything backordered (i.e. paid for but not shipped, which would technically be the case here) must get status updates every 30 days and be fully cancellable. I couldn't remember if that applied to internet sales too, or just the old mail order sales laws it came from. If it is that law, I agree it'd be potentially a violation of that, hence thinking probably technically fraud to block that option by claiming fulfillment.