I don't think that the item is reserved if just added to the basket. However, I noticed yesterday at noon, as the first NF DE red came online, as I added it to the basket, it was still shown atb at the product page. However, as soon as I started the check-out, it was shown as unavailable. I then decided to not proceed with the check-out to see whether it is a restock or not. After I stopped checking out, the NF was shown for the next 5 min as unavailable and after 5 min became atb again. I am sure that was the same item because there was only one shown at stock.Just curious. If ATB, means the item is reserved or it may go missing?
Hence, it means that as soon as you start the check-out, the item is kind of reserved for 5 min. However, it was not a htf piece - might be different with htfs.