The dpf actually uses another injector downwind of the the turbo to inject fuel into the exhaust to burn it off... it doesnt flood a cylinder.. and it only uses this when the heat from the motor is not up to temp.. its a good system but its longevity has yet to be proven...
welcome to oilburners!
and i dont believe that is the case for all diesels, from what i have read allot of current gen diesels use the regular injectors to flood the system like mentioned because it is not realistic for them to add a whole secondary injection system just for the DPF.