Have you looked at the teardown of what this product actually is? Its using a very cheap Allwinner chip inside a plastic case, a similar board can be had for $7[1]. I highly doubt Nintendo is producing much in house, they probably have PCB manufacturing and final assembly outsourced, there isn't much to this device[2] physically.

[1] - https://liliputing.com/2016/11/orange-pi-zero-7-quad-core-de...

[2] - http://www.cnx-software.com/2016/11/08/nintendo-nes-classic-...