Why did Jw's leaders the "governing body" turn to spirit medium Johannes Greber?

This translation was used occasionally in support of renderings of Matthew 27:52, 53 and John 1:1, as given in the New World Translation and other authoritative Bible versions. But as indicated in a foreword to the 1980 edition of The New Testament by Johannes Greber, this translator relied on “God’s Spirit World” to clarify for him how he should translate difficult passages. It is stated: “His wife, a medium of God’s Spirit world was often instrumental in conveying the correct answers from God’s Messengers to Pastor Greber.” The Watchtower has deemed it improper to make use of a translation that has such a close rapport with spiritism. (Deuteronomy 18:10-12) The scholarship that forms the basis for the rendering of the above-cited texts in the New World Translation is sound and for this reason does not depend at all on Greber’s translation for authority. ,This translation was used occasionally in support of renderings of Matthew 27:52, 53 and John 1:1, as given in the New World Translation and other authoritative Bible versions. But as indicated in a foreword to the 1980 edition of The New Testament by Johannes Greber, this translator relied on “God’s Spirit World” to clarify for him how he should translate difficult passages. It is stated: “His wife, a medium of God’s Spirit world was often instrumental in conveying the correct answers from God’s Messengers to Pastor Greber.” The Watchtower has deemed it improper to make use of a translation that has such a close rapport with spiritism. (Deuteronomy 18:10-12) The scholarship that forms the basis for the rendering of the above-cited texts in the New World Translation is sound and for this reason does not depend at all on Greber’s translation for authority. Nothing is lost, therefore, by ceasing to use his New Testament.