This is true, but something doesn't add up.
Uber was able to undercut cab companies because, among other factors, they don't own the cars. Whereas a cab company has to buy cabs and then pay the price to maintain them, Uber only has to pay for the GPS and API, it's up to the driver to buy his or her own car and pay for its maintenance and repairs.
Now they suddenly want to own their own fleet too? It seems they will save on having to pay drivers a share of the profit (and no benefits, 401k, health, etc, just part of the generated profit!) and then spend on buying a fleet of sophisticated self driving cars, maintaining the cars AND also maintaining their self driving equipment... how is this more profitable?