Or, if I were to give the author of the benefit of the doubt, Uber realized that this potentially inaccurate statistical claim ("Uber is inducing a drop in DUI") can help them win people's goodwill in areas where their operations have been thwarted/stunted by bureaucracy.
If so, they are really shrewd (for most laypeople don't understand anything about statistical inference), but I am not sure if I would trust a company that resorts to such a disingenuous campaign.
I actually want Uber to be a success. I love their service and envision it to be a real-time bidding platform for all sorts of (offline) services. But at the same time, I would be concerned if a company of such great promise is already acting intellectually dishonestly.
Hence, I really, really hope the author is just an idiot.