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I'd always assumed DI was first introduced to more reliably control mixture, eliminate pre-ignition and get a stratified charge in CI systems.
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That is correct.
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Viper says:
If you are supercharging then you'll win by injecting into the supercharger and thereby reducing supercharger work.
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A supercharger is a intake system has nothing to do with the fuel metering.
Every supercharged engine has to have a fuel metering system. The Merlin for example uses a carburetor. It has a supercharger but fuel is metered by the carburetor.
Read the article you posted. Rolls Royce does not make the argument a carburetor with a supercharger is better, they argue their engines are not as inefficient as people think when compared to the direct injection used by the Germans.
The only drawback to Direct Injection is complexity and expense.