DTC has real time information on FTDs and naked short positions, ...
DTC settles the trades. If shares are not delivered, they are the party who was stiffed. They are the party on the hook if they do not collect.
It is up to DTC to report this information. I assume they do report properly because they have no financial interest in the party that failed to deliver them the owed stock.
The idea that DTC is committing a multi trillion dollar fraud in a scam that hardly benefit them is comical.