Yup, like mattD said, its not like it will suck in a gallon of water all of a sudden and hydrolock it. It only takes a small amount of water to get all the way up in there for that to happen.
And no we're not dumb, we're just advising what we would or wouldn't do and being conservative about it.....the guy that posted that, where does he live? If he lives somewhere in the south, specifically California, well the weather is a lot nicer there, that's all
Put it on if you want to, I'm not gonna stop ya!