No, you will be able to get the FG at that point. Odds are that they simply ferment a standard cider, and then back sweeten afterwards. To get something the sweetness level your SWMBO likes, you would need to make your own cider and back sweeten to around the same area. This thread has some numbers from other Commercial Ciders, looks like 1.030-1.040 isn't unexpected.
The website for Johnny Appleseed says it has about 5.5% alcohol, so you should be able to get fairly close from that. If you start with about a 1.042 SG, and ferment down to 1.000, you would be right around 5.5%. Back sweeten to taste.