You don't have to be an employee to perform research on the Wayback Machine (archive.org). All I can tell you is that 2 x 50lb allowance for DL Medallions in coach to these regions has been there for many years based on historical snapshots of Delta's baggage fees web page. It sounds like you've just been lucky previously and either had agents who looked the other way or where unfamiliar with DL policy for the region and were giving you the US domestic allowance instead.