Matthew 8:11: Were Abraham, Isaac, and Jacob Already Saved?

A sermon by Victor Porton interpreting Matthew 8. The interpretation below expresses the author’s own reading.

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Matthew 8:11

But I say to you that many will come from east and west, and will recline with Abraham and Isaac and Jacob in the kingdom of Heaven,

How do some preachers say that only people from the time period after coming of Jesus can be saved? Here is clearly said that Abraham and Isaac and Jacob are saved.