Direct Answer
Based on the speaker’s teaching, “the whole gospel” is the gospel of the Kingdom: King Jesus announcing God’s reign “here” and calling people to repent, transfer allegiance, and live in obedience—while also including Jesus’ death, resurrection, and forgiveness of sins. When the gospel is reduced to forgiveness-only, the “king/kingdom” center gets lost, and faith becomes mainly about personal destiny instead of obedience to the King.