Right. However, its also possible that you'll win the lottery or be hit by a meteor. Statistically you have a much better chance of winning the lottery. Statistically, its safer to stay in and have oral sex than it would be to go outside and walk down the street, if we're talking about hiv. You are more likely to be hit by a car or be mugged. (this assumes you don't know your partner is infected, obvioulsy. Unprotected sex of any type with an hiv partner is a really bad idea, even at 1 in 10000).
Life involves risk. I'm not a bush basher, but I find it odd that there are ads for the army all over the place, but the "party line" is abstinence. Government approved literature, etc, will point out that its "possible" to contract hiv from oral sex. Last I checked, they don't point out that its almost impossible, and there isn't a confirmed oral only case known (again, I have read that, but I have not thoroughly researched that claim. See the site I posted).
Not to sound combative, but I think people are a little too freaked out about sex. Be careful, but have fun. Just telling somebody "its possible to contract hiv from oral sex" might prevent them from having oral sex. The chance that oral sex with a person will result in hiv transmission, when you don't know if they're infected, and that person does not engage in high risk activity, is astronomically low. So why do we want to prevent people from having oral sex?
So, in summary, I think the statement is misleading. You were quick to correct me. I would think, in the pursuit of truth, that you'd be quick to back up my statement and echo it. That, essentially, its possible to contract hiv from oral sex, but highly, highly unlikely.