No. It means that they are sold out, and there is no need to keep a sold out shoe displaying on the website. There is no REAL pattern to the FNL restocks. FNL restocks when they restock... Nothing more... The only things that are somewhat predictable are the following:
1. FNL will put up pairs from cancelled orders between 6:58AM and 9:00AM CST (not a true restock)
2. The sizes you see available will more than likely be out of stock by the time you add them to your cart
3. If you are lucky enough to add a shoe to your cart, it will take multiple attempts for you to checkout.
The aforementioned things are not the three commandments of the FNL shopping experience, but these are likely to occur at a probability of 90%