Note that this in theory speaks to performance of a non volatile memory. It does not speak to cost.

We already have a faster than NAND non volatile storage in phase change memory . It failed due to expense.

If this thing is significantly more expensive even than RAM, then it may fail even if it is everything it says it is. If it is at least as cheap as ram, it’ll be huge since it is faster than RAM and non volatile.

Swap is indicated by cost, not by non volatile characteristics.