That's because Giles Newman's first design principle is a spoon is always a spoon:
Each piece must be a functional spoon, suitable for daily use and comfortable in the hand. This constraint ensures that I don't let the complexity of my designs compromise the functional premise of the carving. Creatively this gives me a firm foundation on which to design. Knowing that there must be a bowl and a handle of some sort helps me avoid the 'blank canvas' feeling. My designs always start with the bowl and work out from there.
That's from an interview that the artist gave with the Wood Workers Institute. He describes his work in detail, including his use of hand tools. Newman's techniques focus on the axe and the knife, for which he completes almost all of his work. You can see a time-lapse video of his use of the axe on a spoon here and view more photos of spoons on his Instagram feed.