The FOTW account dates the East German flag’s use to 1989. Volker Moerbitz Keith describes the White Fleet as operating pleasure ships on inland and coastal waters and ferries between East Germany and Poland: inland it used the same jack as DBR, while the triangular flag served as a coastal house flag. An older claim that the company had dissolved and surviving ships might retain its flag was disputed by Rosanoski and removed from the cited page; it does not establish the fate of every regional undertaking.
Keep the explicit scope label independent; no alias or company identity is inferred.