The first half of this article makes a reasonably convincing case that Mr. Khan is a much worse history teacher than math tutor. The second half of the article makes a totally convincing case that the author understands the Internet worse than Khan understands anything.
I guess in his nightmare scenario the "algorithms of the Internet" will one day cause everyone's web-browsers to redirect every request to one of Mr. Khan's fizzy history lectures where he just glosses right over the moral infallibility of the US, the inherent superiority of western culture, and the fact that Jesus died for your sins. The same algorithms will doubtless prevent the author from creating his own history videos clarifying those topics for people. After all, Mr. Khan appeared on Charlie Rose!