No wet road, at an incline like that, would look like shiny glass. That's what he's talking about. It looks like the road is coated in reflective film or glass, not water. It is way to visually clean vs. reality... which is exactly part of falling into the uncanny valley.
You're going to get water films on flat roads, or on flat roads under heat/strong sunlight where you get the illusory coating. This road isn't flat, and the water should be rolling and creating a very different, uneven reflection/refraction combination. The DC gif is not at all representative of a real scenario where actual physics are in affect, not made-up graphical homages.