That analysis is incomplete because any car that gets used at all ages by time as well as by mileage. The car is going to depreciate and degrade on a similar timeline regardless of how much you use it. Keeping miles off just changes the shape of the depreciation function.

At the end of a car's expected life, absolutely. But compare a two otherwise-identical 2016 or 2017 models, one with 30k miles and one with 120k miles.

And ~8yr from now the depreciation functions for both those will intersect.

The only difference is depreciation now vs later.

That's true especially in regions where there's salt on the road in the winter. But depreciation is usually a lot more mileage-based than time based.