The confusion probably stems from the fact that the product manufacturer, Musion, repeatedly claims that they build "3D Holographic Projections", even though they're obviously neither 3D nor holographic:
This is the same company that did the Tupac "hologram". It's all based on Pepper's Ghost, a 19th-century illusion involving a projector with a screen that reflects the projection, but looks transparent in front of the actors.