I don't think Rob was implying that the Uber CEO isn't grieving this loss. He's making the point that it's likely NOT why he's taking the leave of absence.
Kind of like James Comey's firing. Maybe what he did with regards to the Clinton email affair wasn't right, and possibly even a firing offense. Heck, maybe despite what the acting FBI director said about Comey having broad support of the FBI, he actually didn't, and it was in disarray. That stuff doesn't matter, because the question is why WAS he fired. And Trump himself said on multiple occasions, it was because of the "Russia thing."
So back to Uber piece-of-shit-in-chief. He's allowed to grieve. He probably genuinely is, unless he's a full-on sociopath (a possibility). But the evidence is that he is leaving due to their current crisis that he's been a big part of. The accident happened weeks ago. Why did it take him weeks to take a grief-related leave of absence? That's not normal, people usually take time off of work for a death right after the death, not weeks after. The timing is highly suspicious. This is what I interpreted the quotes to mean. I think your calling Rob "disgusting" is over the top.