I don't really see what those two things have to do with each other. When you don't use mmap, you manage the disc<->ram storage virtualisation yourself. Hardware paging, then, is pure overhead. The parent doesn't argue against layering of storage media, nor against chunking in general. Only against mmus as a mechanism for implementing it.
The 'paging' is implemented in software, not in hardware. This is how databases not using mmap already work, so mmus are already pure overhead for them.
