the picture is a fake
here another fake with the same picture
Well, uhm, no, that doesn't prove that the image is fake, only that someone has used that image to create a fake.
I can accept if the image is from Square, it does look like something they'd produce. I'm a bit more sceptical about it being FFXII, though; partly because it's from 2001, partly because the logo looks wrong (like if Final Fantasy is in bold style and XII is not) and different from the FFXII logo text currently displayed on real FFXII images. But it could still be something like a test project from Square's 3D studios, so I wouldn't be surprised if it turns out to be "genuine". Nor would I be surprised if it's just a nice 3D image and someone thought "hey I can fool people into thinking this is FFXII" and slapped a logo on it.