That said, you are talking differences of air fuel charge delivery.
This would however not be the case with a turbo diesel engine since air volume is also increased by the turbo's output (and you would need more fuel injected to keep up with the extra air). Diesel engines have less strict air/ fuel ratio requirements, so you may have read about something that adds gas to control engine speed while letting the air regulate itself by rpm correlated vacuum which would not run great in a gasoline engine. Maybe you misread the bit on diesel engines, but it sounds like it is speaking of a specific engine's way to control rev speed. For more power you need both more fuel and more air, this isn't any different for diesel. Both need to increase for the stoichiometry to be ideal.
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