The Gold S31 utilizes all in-house components from its built-in DRAM, firmware, and NAND Flash to be a "full" SK Hynix product. Although exclusive to the U.S. for now, additional M.2 PCIe models are expected to arrive for both North America and Europe sometime next year.
https://www.notebookcheck.net/SK-Hynix-launches-new-Gold-S31-SuperCore-series-of-inexpensive-consumer-SATA-III-SSDs.430339.0.html