Correct treatment Turbocharger

Hi The dealer said it makes sense not to stop the Focus ST immediately after stopping, a minute is waiting for the loader. I suspect that it is about the thermal backflow, the loader cools down a bit (lifetime). Is this also true for leisurely city traffic for all trips or only after the spores have been given to it? If the loader is actually supplied by the engine oil circuit, are they plain bearings or ball bearings? a loader of the company KKK, has jemad the type at hand so that you can learn more about this component? Thank you