SDF example not working (SDF missing in namespace)

The example for VFX graph 12.1.0 doesn’t work for me (Win10, Unity 2021.1.0f1)

Assets\VFXUpdateSkinnedSDF.cs(7,5): error CS0246: The type or namespace name ‘MeshToSDFBaker’ could not be found (are you missing a using directive or an assembly reference?)

Am I missing something?

Nevermind, seems to be another one of those things that breaks when you use assembly definitions…God what an ill thought out cluster frack assembly defs are in production.