Why your Uber app is lying to you about available cars
bgr.com
bgr.com
The support representative's response is wrong and appears to have been contrived. When you're dealing with support volume on the scale of Uber, you're bound to get some tickets that are answered incorrectly.
Other than having access to some internal tools for account lookups, support staff at Uber (and many other companies) do not know anything more than what is publicly available. It's why an Apple live chat saying "yes, iPhone 7 will have a larger screen" means nothing.