Put the silken tofu and soy sauce in a tall jug and add 3 tablespoons of the reserved pasta water. Use a stick blender to blend to a smooth sauce, then pour into the pan with the mushroom mixture.
Put the dish back into the air fryer and spoon in the pasta, stirring to ensure it is well coated in the sauce. Cook for a further 8 minutes. Scatter over the olives, feta and parsley and mix well.