It's TLC from what I recall. Pricing is an issue...ultimately NVMe SSDs will get faster and we'll view this as a transition period I think. Optane is fundamentally different though and it remains to be seen if they can get capacities up. There's also the PMEM issue, and how much speed that enables vs accelerating at the storage drive layer. Fun times.
The LaCie d2 Professional gave decent performance for external spinning media and offers massive capacity in a small footprint. Creative professionals that crave a lot of capacity in a slick looking box can't go wrong with the LaCie d2 Professional.
LaCie d2 Professional Review (10TB)