Of course it has a front pump! If it needed the driveshaft to turn to create hydraulic pressure, it would never be able to engage the forward or reverse clutch to make the driveshaft turn to engage the clutch to make the driveshaft turn... Do you see the problem?

The burnup problem in the ZF is that a slight amount of wear at the front stator bushing will allow low fluid pressure to accumulate behind the forward clutch piston. If the fluid pressure had bled before this occurred, there was not enough apply pressure to cause a problem. BUT... if the shifter was taken from P or N and put into any drive gear - the pressure through the slightly worn bushing prevented the apply pressure from dropping to zero and it kept the forward clutch plates lightly pressurized even after shifting back to N or P.

If the engine was run, especially at higher engine speed like during AC service or emission testing while the clutch was partly applied... that was the end of those friction plates and the beginning of another horror story.

The workaround was to shut the engine for 30 seconds or more and be certain that the gearshift was not moved from P or N after restarting if the engine was to be revved for service or testing. The service repair for the ZF was to improve drainage of the forward clutch during disassembly to ensure proper release.