Hmm, their stuff doesn't look like CSG to me - look at the blends and morphs for example, those are certainly not CSG operations.
Also, don't trust wikipedia. CSG means something very specific and is not just an interface that lets you do Boolean operations. See explanations from some of the guys who came up with the stuff: Requicha (pdf) and John Woodwark's website
Only a system which has a CSG tree as an internal representation and point membership evaluation can be called a real CSG system. As soon as it stores surfaces, it's just back to being a plain old BRep system.
The packages you mention don't actually use CSG, whatever they may call their operations. Ones that do are: iCAD (from japan), BRL-CAD (US-Army, now open source) and the old AutoSolids add-on for AutoCAD (which is dead now).
If you're interested in reading up some more, a good starting point might be the original reports
I can help if you have further questions