I replied to that same old thread that you are talking about:
https://retropie.org.uk/forum/topic/22692/fake-8bitdo-sf30-pro-way-to-get-working/21

As I mentioned over there these controllers work just fine over Bluetooth on my Linux PC, but aren't detected over Bluetooth on the pie. Thought I'd drop a comment here also so I can see if any progress is made by anyone else.

@Clyde said in Fake RetroPIE Oficial facebook group:

...is said to have inspired its name. Another explanation originates from employees at Post...

Another possible origin involves its creator randomly combining the names of two items he saw from around the room.