yes, but only because we are not used to seeing this. doesn't mean the stands are not safe. but it illustrates the point that the manfacturers are telling the truth.
glass tanks only need end support.
if you tried this with an acrylic tank however, the tank would fold and you would have a big mess.
but not so with glass tanks.
there is a thread somewhere on cichlid forum that explains the physics behind why this is so, something about how the bottom glass panel acts as a girder and becomes extremely difficult to break.