i checked the board that i made as a final, its correct that this is a wrong layout, if its corect there must be another board layout on this side.
i lost all the files that was made with easyeda, but i found 2 picture from the latest board i made and tested, this board is working but you must be sure that you have the same 3,5 mm stereo jack ( in the original design the contacts don’t match, so switch them if needed).
I also found a short test movie where you can see that the board is working
front view of the board https://www.flickr.com/photos/panchozya/48329013301/in/dateposted-public/
and the back https://www.flickr.com/photos/panchozya/48329143652/in/dateposted-public/
Note: this was before the updat from martyn with the other flashes but if he has the updat corect then the other flashes must also working (not tested by me)