Yes and no. Several of these could probably be done with a proper model and "vase mode" in a normal slicer. However, others are simply not possible in a normal slicer because slicers limit you to planar layers and moves. So for example the pin-support challenge cannot be done in a slicer because they would try to slice the pillar into many individual layers with retractions and moves instead of continuously extruding while increasing the z-height as this gcode does. Similarly, the non-planar spacer wouldn't work in a normal slicer either because it's non-planar by design.
I am confused about how this helps with printing those parts shown on the website.