Look at where it ships from. That will answer your question.
I know this product is coming from China, but that does not answer my question.
Bricklink does not even have an inventory of the parts yet, but somehow these guys know not only what parts were required but also made those 4080 pieces in appropriate colors, in molds that are probably identical to the originals except with the word LEGO removed from the studs. I don’t think they steal the sets and then slice the word LEGO off each stud, I think these guys are manufacturing entire copies of the set. The thing that amazes me is how quickly they did it – before the official release date. These sets must be sitting around in a warehouse in China for months, allowing someone to get a hold of them and setup the manufacture process.