That doesn't explain the owner that swapped out their 60 battery with an 85 for ~$18k from Tesla. A 40 has a 60 battery. Tesla would be getting back a 60 battery, just the same as the aforementioned S60 owner. Sure, maybe the 90 will cost more than the 85 battery, but surely not be 42-45k for a swap if the owner is trading in.
Besides that one guy a few years ago, has there been a single other example of someone actually getting Tesla to do this 60 to 85 swap?
One car upgraded out of how many sold? I'm pretty sure Tesla doesn't really want to be in the business of selling bigger car batteries to existing owners. They would much rather be selling a new (higher capacity) Tesla to an existing owner.