The chipper you are seeing is an efficient way to reduce any type wood into chips & chunks which would be placed in a pressure oven and reduced to charcoal.
Not every country around the world makes their charcoal into nice evenly shaped little pillows.
During the process of reducing what ever type of wood that has been ground into chips and burned the wood gas given of by them adds fuel to the burn process.
the older drier the wood the less time it takes to make charcoal out of it and the less outside fuel source is required.
A large sack of charcoal chips typically sells for 1/3 the cost of a bag of pillows but you never know what the quality is going to be