Those look distinctly like Intel SSDs in the article photo. DC P3700 units, I believe.
Interesting that they would prototype with one vendor and ship with another.
Taiwanese server-maker Wiwynn will bring Facebook's latest JBOF (just a bunch of flash) devices to all comers by Christmas. The ST7110-30P is a 2U machine that can house 60 solid-state disks or 30 NVMe drives. Facebook's packed it full of PCIe interfaces – 16 version 3.0 ports to be precise – because that's how the device …
Don't worry, just as with the current Knox design, the drives are hot swappable and can support any NVMe SSD that is on the approved vendor list (tested by Wiwynn).
At exhibitions usually there is a sponsor for SSDs or drives, this time it's Intel and HGST.
It will probably support both Intel & Samsung.
Wiwynn is from Taiwan by the way.