Exactly. It’s an automated process as far as I’m aware. They might be manually reviewed from time to time, but If the owner of the Paypal account disputes a charge, it’s disputed through the resolution center… which is all just a selection of checkboxes and dropdowns etc.
The only reason I can imagine a dispute being dismissed or rejected outright, is if it’s not been conducted through the resolution centre, or it’s been too long since the purchase. As it was only last month, I can only assume you’ve not followed the proper dispute process. I could be wrong, but we don’t have much info to go on.
Either way, I hope the anti-fraud organisations help you to get the money back from Paypal and/or the thief.