Yeah the second he said that he was invested in Uber's biggest competitor, I couldn't take him seriously. Uber has gone over the line sometimes, but he's obviously going to make it sound worse than it is.
That all being said, I think you overestimate the probability someone will call him out on anything. When was the last time someone was ever called out for making a bad prediction, making a false but ultimately mild allegation, or raising concerns about a competitor? I've worked at places that would state publicly that their competitors steal from customers, and never heard that even questioned on a factual basis, forget someone doing some weird kabuki theater credibility sacrificing ritual.