You can move a virtual camera 3-dimensionally within the scene at any individual frame (x, y, z), and also move the scene through its animation to play the animation forwards and backwards (in other words, you move the camera through the 'time' axis).
So, like the scrubber in any video? Doesn’t feel like that warrants the 4D moniker. Which is not to say you’re not right, I think you are and that’s what they mean, but it that being the case it feels more buzzword than anything.
You are correct though, they both serve the same function.
However, I’ve yet to see a video player that lets you reposition the camera as if you were using photo mode in a video game. That’s (essentially) what this thing offers.