This is fake. Whether its drywall, wood lathe and plaster, or drywall with a plaster coating, the paint and plaster would be cracking due to the stress of that bulge. If it's between the wall and the paint, even if its latex it wouldn't hold. Water may not feel heavy in a glass in your hand, however by the looks of how many litres of water being held there, come on. Too much stress to look normal.