Hmm have not tested but a spark plug doesn't really need shop tools to be replaced; maybe trying with a way bigger repair like "I need my transmission replaced" would bring different results?
Remember, the question is: “I need to replace a spark plug. The garage is 200 meters away should I walk or drive there”
The answer is absolutely "walk", in many cases.
If the question had been "I need to take my car to a repair shop for some work. The shop is 200m away. Should I walk or drive?", then the answer would be less ambiguous.