Those are label projections, they are true and can be pretty close to what the final is considering it gives insight into how much product is being put out there.
Semi-dud like "Diamonds"? It's only been out for two weeks and is rocketing up the airplay chart and is maintaining itself on iTunes. "We Found Love" performed similarly and it went on to be a huge hit. By the time the video gets out there it'll be a certified smash.
Besides that, her last album opened slightly less than that with no promotion whatsoever besides a X Factor performance lol. It's easily obtainable for her, but we'll see.