Maintainer of the module here 
As noted above, this Node was renamed (they all were)
But the error already calls for its new name.
The splitter Node, doesn't have any special requirements to appear in the palette, so Node RED start up/module install logs will be nice to see.
And I couldn't but help notice: which will include latest Zwave node's
Ensure to check the full change log if migrating from <11.
Here Release Release v11.0.0 · zwave-js/node-red-contrib-zwave-js · GitHub
And here for a guide
