They're including depreciation which makes sense for small businesses that turn over their fleet every X years.
If you're not swapping cars ever few years depreciation per mile is basically irrelevant because age and what you use the vehicle for will dominate depreciation.
An Uber driver will typically drive 30-50,000 miles/year (looking at a few quick search results). At that rate, your car will wear much faster and require replacement or major maintenance much sooner than is typical.
If you're not swapping cars ever few years depreciation per mile is basically irrelevant because age and what you use the vehicle for will dominate depreciation.