The payment is authorized by the author (i.e. his PP account wasn't stolen), the whole thing being a scam is irrelevant and PayPal shouldn't be the judge here (if you got scammed and send some physical items to the scammer, can you ask the post office to take it back?)
I sold digital goods on eBay a few times (like, less than 10 times) and I've already got 3 (!) people claiming their purchase is "unauthorized" after I sent them the goods (redeem codes, so I can't really let them "return"). I'm more than glad that PayPal took my stance instead of giving them chargeback, since they're likely trying to scam me.