My point is that we already have lightbulbs that are better at generating light than the sun.
Why do you say that? Your citing of the metric offers no context to what we make of the sun - and note that with respect to the sun the wattage component of the efficacy apparently refers to the radiated heat rather than direct source electrical consumption or conversion.

No, what you have cited goes toward evaluating some lamps against others in generation of light. Don't misuse metrics in response to a criticism of the misuse of metrics.