The Greek word comes from the Greek-language OT written for Alexandrian Jews 200 years prior to Christ, the Septuagint (LXX), the same Old Testament quoted in 95% of the cases by the Apostles in the Gospels. I have no idea why you would be using the source the Gospels did not use.
Besides, the tense and the context of the whole sentence shows that Job is talkiing about the Holy One who is about to redeem/rescue him from his presentsufferings. Your version talks about the "latter day"? We are reading two diffreent stories here.
You said the Hebrews did not look for a redeemer; I used the Hebrew text to show that they did.