The claim is being made concerning Hebrews 2:14 that Jesus was a failure since he did not destroy the devil as spoken of in that verse.
According the New King James Version, Hebrews 2:14 reads:
Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil.
Evidently, some are seeking to find fault in the Bible by reading into this that this means that at Jesus’ death, the devil was supposed to have been destroyed, but that he wasn’t and therefore it is offered as proof that the Bible is not true.
In reality, Hebrews 2:14 does not say that Jesus “destroyed” the devil at his death; what it does say is: “by his death he might destroy him who holds the power of death–that is, the devil.” The word “might” here is used in the sense of “may be able to”. Having received the authority through faithfulness until death (Philippians 2:8-11), Jesus will be able to destroy the devil in due time — after the millennial rule. — Romans 16:20; Matthew 25:41; Revelation 20:7-9.
The Bible is in harmony on this; Hebrews 2:14 does not in any way offer any proof that the Bible is not true.