The image was from the modder.OMG. The image you quoted from gizmo to claim that off-the-shelf parts work is from the modder. And it's using a disassembled xs card.
The article you're quoting about the adapter says:
then
The article i posted was specifically about a different adapter.
Another person used that adapter and is testing drives to see which ones work.
Obviously it’s limited at this point, but that will get better in the future.
The whole point is that there is a “non-proprietary” solution and as with anything else, as time goes on those solutions will get better/cheaper.