
You got bad information, the board in his picture is clearly the game card reader and 3.5mm jack. The NAND (eMMC) on the OLED switch is soldered to the motherboard.The game card reader on the oled model is soldered to the board. Not like on the older revision where you can swap it out by unclipping the reader. The connector on the oled model is for the nand chip iirc.
EDIT: The black board IS the nand chip (i googled it).