Did this Rabbi become a Christian...? Did this Rabbi ever acknowledge that Yeshua was Messiah, Christ come in the flesh? It is important based on 1John4. If this rabbi never accepted Christ then his prophecy is suspect, even if it remains accurate in some respects...it’s intrinsic message will lead away from Christ.
Do you imagine that God has only information for Christians during the Church Age, or can He also speak to Rabbi’s of the Jewish people, to prepare them for what is coming during the Tribulation period when The Church is no longer here? Have you heard of Rabbi Kaduri? He, as afr as Jewish folks say, did not become a ‘Christian’ as we would define it. But he left a message to his followers giving the name of the coming Messiah ... he identified Jesus the suffering Messiah would be coming soon as the Conquering Messiah.