Understand this is a point of view not a doctrine or dogma. This is typically used to provide additional consideration of the Old Testament as many Protestants tend to view the OT as a bunch of stories and songs but with very little relevance to the NT.
A short summary of this view point is that during the time of the OT, God’s presence via the Holy Spirit resided in the Temple. When Jesus was baptized, the Holy Spirit in it’s full power was withdrawn from the Temple and descended upon Jesus. Then Jesus conducted his ministry and was crucified. At that time, the Holy Spirit was released and descended during Pentecost.
To that end, the OT law was in effect until Jesus’s death. The law of sin and death was not superseded by the law of grace and mercy until the Holy of Holy curtain was torn, symbolically removing the separation between man and God, because God has left the temple and now resides in our hearts. As such, the Gospels are the history of Jesus ministry and if one take the view (thus my use of the term view point) that the OT law burden ended with Jesus death, they would then from a time line view, fall into the OT.
This view then used to educate others about Jesus being the head priest and why the numbers, stories, feasts in the OT were a foretelling of the coming of Jesus and how he fulfilled the sacrificial requirements and how that tied into Jewish tradition.
I should point out that at no time does this view change doctrine or dogma. It is just another way to drive a point home.
I hope you are wrong that few protestants understand the prophetic relevance of the OT and the new
And where did you find that little bit of misinformation?