Can u tell me how to achieve this look?

yeah, if you notice the narration of the video, they tell you the further separated the hair for the more voluminous look. If you look at the small section of her head that they show as she is taking out the twists, it looks more like the picture you were looking at. You just undo the twists, don't separate them out or fluff them further as they did in the final step of the video.
 
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