omg,... seriously,.. I can only guess this maybe a new AutoDesk marketing word?
ok,.. interesting... after searching.. it's Parametric (technical) vs Freeform (non-technical)
Anybody can create surfaces, the trick is turning on the "Zebra" stripes to see how they align and whether or not they do what's expected.
term 'technical surfacing' - there is no such term.
There is term a surface - twodimensional topological variety.