Answer:
He completed a prophecy.
Step-by-step explanation:
The prophecy was, long story short, him killing his father, marrying his mother bring destruction to his family and city.
Because Polybus is dead.
Sophocles employs dramatic irony which intends to reflect the author's message to the audience and the characters don't see it. The given statement by Oedipus is ironic as it suggests the incompetence of the Oracles as Polybus is dead now and took them to Hades. He is critiquing the authenticity of oracles as it is of no use as he(Polybus) no longer exists and symbolizes his concern. This shows his anguish and mockery against the "prophetic oracles" as it could not help saving him from the mortality.
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