How does not owning a car imply outsourcing those things? That's only true if you hiring a cab everywhere you go and order all your groceries to be delivered. If I bike everywhere I go, including the grocery store I'm not outsourcing cars. All the miles I would normally put on my car I put on my bike, or public transportation.

The grocery store uses cars to transport goods from farmer to the store. The whole supply chain uses cars (petrol, resources, poisoning air, causing accidents, ...), you're outsourcing to them.

You know, if you think about it for 5 minutes, your point makes absolutely no sense at all.

"Outsourcing" would be if his decision not to drive a car required him to pay people to drive cars on his behalf. That's the definition of the word "outsourcing". But you're talking about transportation that occurs whether he drives a car or not. The groceries you get at the store are driven there also. Him choosing not to drive a car literally has 0 impact on the transportation infrastructure of the supply chain. That is not outsourcing.

The grocery store uses trucks to transport goods because doing it by bicycle/foot simply does not scale.

But just because that part of the logistic chain involves ICE vehicles does not mean that every part has to involve ICE vehicles nor does it mean that people not using a car to do their shopping are "outsourcing" anything: The large-scale logistics happen regardless of how people get to the grocer, people getting there by foot/bicycle/public transport have literally zero influence on that end of the logistics.

actually big trucks carrying huge amounts of goods in a single shipment is much better for the environment than hundreds of people driving their cars to bring home a couple kgs of stuff