I watched the debate, but I wasn't counting personally. FiveThirtyEight is a reputable website. And they're best known for their political coverage. Nate Silver has been covering elections for years, and has become something of an authority on statistical political analysis. They were tracking the debate in realtime, and would have gotten called out thousands of times by now by their readers if their stats were off. They routinely tweak their articles to be as accurate as possible. No changes have been made to the infographic.
Your claim that no questions were asked on the subject(s) is wrong.