LG C1 OLED 48 inch TV

This was in stock the other day and so I ordered it. What surprised me is that it won’t be delivered until September the 12th?? Why such a big delay? I looked at the other size C1’s and they ship out in just a few days, I don’t get it. I understand that this is currently a very popular TV. If there was some sort of inventory mistake and I was able to purchase it anyways, how can amazon be so sure that the TV will be in stock so far in the future on or around September 12?