Its been said here a few times now .... but just to make it absolutely clear .... the cooling fans can coolant pumps can and will run for up to a few minutes after the car is switched off and the key removed. These are all quite noisey but do not confuse it with the engine running.
THE engine SHOULD NOT be running after it is switched off. If it does, there is a problem and a VW dealer should investigate. It is VERY unlikely to a turbo timer (99.999% actually) as these are not common to VWs.
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