Could you please pass this along to whoever maintains the official documentation at:
It is important for smartthings users to understand that thread and matter are two different things, and it is entirely possible to purchase a thread-certified device which is not matter-certified, and consequently, will not work with smartthings.
A good example is the Wemo scene controller. It does use thread. It doesn’t support matter.
The official smartthings FAQ documentation has a link to a list of thread-certified devices and says they will all work with matter. That’s wrong.
You can find a list of supported Matter Thread devices here.
It should instead link to the list of matter certified devices