The interesting bit (to me) is the algorithm. They automatically detect how slow each available swap space is, and how sensitive a workload is to memory latency and then swap memory pages into compressed dram or nvme storage in an optimal way.

So yes, it's "just swap space" but highly optimized.

It seems kind of, but better because memory can be compressed and/or paged out using a more advanced algorithm than before which assumes fast NVME's available to inform it's decisions.

Compressed swap has also been around for ages.

There's also been swapping to GPU memory (if free).

There are also advanced page replacement algorithms.

One interesting algorithm I read about a while back was using LZW not to compress swap, but to predict future page usage from past patterns.

etc. etc.

It's all still paging/swapping.