That’s not what that post says.
Z wave has two completely different kinds of scenes. The original, local scenes, where the scene controller sends a command directly to the end device without telling the primary controller (the hub) about it.
And the newer “central scenes” where the scene controller sends a command to the hub with the central scene number, and then the hub does stuff with it.
Z wave introduced central scenes primarily because of the increasing use of mobile apps since if the hub Doesn’t know about the instruction, the mobile app will get out of date. But they are also very useful for multiprotocol platforms like smartthings and hubitat.
So the post that you linked to actually says is that it would not make sense for smartthings to implement Local zwave scenes. it says nothing about Central scenes.
( I told you this stuff was technical. )