You contradict yourself. If it's a demonic miracle then it's not a fake by a charlatan. It's either supernatural or it's a man-made fake. Can't be both.
The amount of evidence supporting the truth of St. Pio's stigmata, as well and the testimony of miracles related to Pio, is so overwhelming as to be undeniable to all but the ignorant and willfully blind.
Far from embracing Padre Pio, the Church heirarchy placed heavy restrictions on him and tried repeatedly to prove his stigmata were fake. But they failed. Padre Pio was a true man of God.