Not really, no.
Optane was RAM that was on the CPU bus, but nonvolatile. No need for disks. Boot, and just turn off; when you turn back on all your RAM contents are still there.
You'd need some normal RAM. Optane was big and fast but it had a finite number of write cycles. 3 orders of magnitude more write cycles than Flash, and Flash can only be rewritten a whole block at a time while Optane can be rewritten 1 byte or 1 word at a time, but you'd still need a few gigs of plain old RAM as workspace... plus another terabyte of RAM that held its contents forever.
The basic plan is called Single Level Store and it's much older than Unix itself. IBM i is the only modern shipping single-level store OS.