I took a look on this seller in the 1688.com link, "深圳市福田区赛格电子市场炬火电脑配件经营部". It may be a motherboard wholesale backed by 1 or more OEM factories for various motherboard designs from different brands.They told in the comments that they will not outsource components on Aliexpress, but directly from supplier.
They link this chinese site https://detail.1688.com/offer/684010688925.html?spm=a26352.13672862.offerlist.6.25a12f73uXyJ4s that is selling the board with N5105/N6005 at 700 Yuan (100$) if you order more than 100 piece.They have more than 5.500 piece so for sure the price will be lower.
I think that the price is pretty clear and do not seems a scam.
For me it is more
They will deliver?
Will this work?