Because if I were the real Satoshi, I would have used my birth name on the design paper? Perhaps I would have used the name of a random young gentleman I met once at the Crown & Anchor, who very clearly was not involved with Bitcoin, because I thought the name had a certain mystique.
As said, the evidence presented is all circumstancial.
Regarding your example, the reporters would be searching Satoshi based on this random guy's name. If they found a person with same name and who has the credible attributes to be the Bitcoin founder, it would obviously be a false positive. Yes, it is possible that Dorian is mistakenly identified as Satoshi.