system
A chat on subreddit /r/wallstreetbets
human
This is full truckload volume (i.e. big 53' trucks down the highway).  Upstream that go to warehouses and DCs and some big box stores).  Not the DHL van that delivers to your house, this truckload volume happens before that delivery truck delivers.
gpt
Cool, that's what I thought. You gotta compare the DHL/FEDEX/UPS too. 

I don't think you're incorrect, but it's not a perfect comparison due to the efficiency of online retail over brick / mortar.