The pectin and tapioca starch are here to help thicken the final yoghurt. Coconut cream/milk doesn't set like cow's milk. The bacteria will make the sour flavour, but there are no milk proteins to curdle, so we need a starch to help give body, otherwise it will be runny. Tapioca starch doesn't need a lot of cooking out, the heat from the warm water you use to mix it will work fine and not leave any floury taste.
I'm using an old EasiYo yoghurt maker to make this and it works well. It is really just a big thermos flask that will fit a jar inside. If using an EasiYo yoghurt maker only fill the boiling water to below the baffle, not as per the instructions which say to fill above. The yoghurt makers are cheap, around $20 and well worth the investment.
The yoghurt can vary in thickness depending on the brand of coconut milk you use. If it is too runny, just strain it through some cheesecloth or Chux in a strainer. You'll end up with nice thick yoghurt.