Yeah I hear you...I'm just reading between the lines of what they were stating in the article, assuming that just because the status is unknown, they are likely to be HIV positive. This is not the case. True, the sexual interaction is more of a gamble...but the odds of infection itself doesn't change since the person a paranoid person would eventually have sex with would have likely been asked about status, etc. Possibly even with verification.
My only point was if you were a person so afraid of HIV that you purposely avoided having sex with men who were positive, you are likely NOT a person who has sex with someone whose status is unknown. It just doesn't add up that you'd be a person who vehemently rejects HIV+ men for safety and ALSO be someone who doesn't even try to find out if the men you're dating are HIV+ in the first place.