The calculation is ridiculous. According to his example, if someone had been working almost full time for a year, they would have accumulated enough funds for a whopping 2 weeks of paid leave OR medical insurance -- but not both! And they couldn't have done it any other way because they wouldn't be so big otherwise.
Further, his central argument revolves around the fact that since Uber recruited drivers as gig workers promising them flexibility, their survey shows, unsurprisingly, that their drivers want... flexibility. Proof that nobody needs benefits, for sure.
Mr. Khosrowshahi isn't even trying to sound convincing.