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According to the Light Novel We do Knot Love you its implied Yhwach is both living and dead. I'll provide the quote now.
"After Kurosaki Ichigo triumphed over Yhwach, that dead body was transported to the Soul King Palace by the hands of the Zero division. Hundreds of bindings were placed around the dead body which still contained a vast amount of spiritual power even after death, by storing it as the new lynchpin in the Soul King Greater Palace, the world was spared from collapse."
Now, I'm not sure about type 5 myself but your Reiatsu leaves when you die and Yhwach still has his Reiatsu. I can also possibly see this as resistance to sealing as the seals placed on him didn't do much.
"After Kurosaki Ichigo triumphed over Yhwach, that dead body was transported to the Soul King Palace by the hands of the Zero division. Hundreds of bindings were placed around the dead body which still contained a vast amount of spiritual power even after death, by storing it as the new lynchpin in the Soul King Greater Palace, the world was spared from collapse."
Now, I'm not sure about type 5 myself but your Reiatsu leaves when you die and Yhwach still has his Reiatsu. I can also possibly see this as resistance to sealing as the seals placed on him didn't do much.