From the website:

The NAND-AID is an interposer that installs inside the Wii-U as memory replacement for failing/corrupted NAND memory. It allows you to use an SD-Card to replace the internal memory without removing or “hot airing” the old surface mount NAND package. The NAND-AID also allowso you to manually back the failing memory off of the original NAND when used with the SD Tool.

This is fantastic news for those failing Wii U consoles out there, they get a second chance at life!