I think the problem is they analyze it by how it appears to work rather than measuring raw numbers. Because honestly, I don't really understand why zram compresses better either.
Because the interactive diagram on that blogpost below "LRU inversion" is interesting, and it's a great example of what should happen, but it's not accurate to my experience. What actually happens, IME, is that 1, 2, 3, 4, 5, 6, , 8, 9, 10, 11, 12 stay in zram forever and never get swapped to disk. Even when I had 8 gb of ram (on the mac mini) I had that experience.
