I agree that this lack of proper docu is a constant pain for users and even more for us.
While one user only gets to deal with this once till he's found the answer, we have to do it over and over again for each user anew - but we don't loose faith in Particle that they eventually will be able to solve that issue which is partly rooted in quick growth and also limited human resources.
Till then we try to help as best we can - absolutely voluntarily and for free in our private spare time.
As for your problem, this post (further up in the thread you linked) should actually give the solution (the user in the other thread just failed to get all the info incorporated immediately and so the thread got rather long)
Adafruit SSD1306 [SOLVED] - #8 by ScruffR
BTW: Can you post the link to the "erronous" docs and what exactly you see wrong, so we can correct it?
Is it "SPI3_MOSI" instead of "SPI1_MOSI" or what else made you think the suggested wiring wouldn't work?