Yes the Version Comparison pdf you shared above accurately compares the differences.
In real world usage, CAD HD is highly limited by only allowing Native CAD formats to be pushed to Keyshot.
Ie. You will be restricted to Basic Texture Mapping options, cannot use UV Unwrapping for examples model exported from Alibre, Unwrapped in Blender/Rizom, textured in Substance and brought into Keyshot either directly or via Alibre.
Afaik Alibre has no mesh import formats which can keep a UV map to pivot around this issue.
Bottom line is Keyshot CAD HD is only good for basic visuals and will hit it's limits for even decent photoreal Product Vis use case.
I see little point in learning & using CAD HD compared to other offerings.