Bulk bitwise operations in a memory array driven by an out-of-spec controller is a thing, but I'm not sure why they're using NAND for this and not DRAM like eve

Bulk bitwise operations in a memory array driven by an out-of-spec controller is a thing, but I'm not sure why they're using NAND for this and not DRAM like everyone else, and why it's so small (just 80M weights). And the page is insufferable and doesn't tell anything about how it works. Everything about it seems off.