If it were me and I orderd a kit I would assume it had all the fabric and directions neccessary to complete. Most kits will tell you if the backing is not included , so why would they think that telling you the pattern was not inculded when you order is so trivial as to not to inform.
Even if they did assume you purchased the magazine, some do not get to making the kit for ... years and the magazine would likely have been lost , discarded etc.