Inhouse they have a sophisticated and long recruiting process. When outsourcing they take the first they get (and as a new customer, be assured, you do not get the best engineers but you need to fight to get them).
my company tried to outsource a ancillary product we develop in 2011-2013 timeframe. It wound up being non-viable and we brought it back in-house.
I think many don't see how pernicious turn-around times can be. They continue to build upon each other like compounding interest. It can be a very very hard loop to break out of. The cycle of question -> answer -> further question -> meeting can grind progress to a halt when each iteration takes 12 hours.
This article is not talking about outsourcing but offshoring. Uber still has total control on the people, the project and rewarding the right behavior. It will just happen in India instead of the US.
But you are right.