Earlier quoted context omitted.
Place an order by noon for groceries plus anything you want from Amazon. Amazon fills up truck(s) at whatehouse and drops off at local Whole Foods. Stop by on your way home from work and they bring your items to your car. You get free same day delivery. Amazon just greatly saved on last mile delivery costs. That's the value of those nodes without having to store all the inventory.
I'm closer to Whole Foods' nearest distribution center than an actual Whole Foods. The nearest Whole Foods is almost 40 miles away. If this works out for Amazon, I wouldn't be surprised to see Walmart try and buy Trader Joe's. They own Aldi, which has made a big push to compete with Walmart's reach outside cities. The nearest Aldi is closer than Walmart, and that's already not far away.
The two Aldi locations I drive past are both located less than a mile from the nearest Walmart locations (I expect they do a fair amount of piggybacking).
The purchase doesn't make a huge amount of sense to me. I guess the most sensible thing is that they see the stores being located by the best populations to start out doing food deliveries for (affluent, so they can charge higher prices while they figure out how to do it).
Walmart has a pickup service. They keep experimenting with rapid delivery but people don't really want to pay much for it.