Dear @ranpelta,
we will look into it. Where did you read on the 14 unique classes and what they represent? The algorithm page doesn’t yet mention them and I could also not see any reference in the Sen2Cor v2.10 release note.
In the meantime I suggest you use your own custom script to display the SCL band. If you slightly modify the one in our custom script repository (here - and then on the top “Show script”) you will be able to visualize the SCL band with the 14 classes via the custom > custom script option at the bottom of the layer list.
Best,
Daniel