So you can verify your rolls, it doesn't mean it's 100% safe but at least random.
Safe from whose point of view? You the user? Or Doog the site administrator?
For you it's safe. It's showing that the rolls can not be manipulated in the sites favor.
For Doog, not as safe. If someone figured out their seed, they could in theory Clean house.
Except they can't figure out their seed. It is never 100% risk free for the user.