I don't think the Khan Academy videos have ever really aspired to be the most pedagogically nuanced videos anyways. It's not necessarily a huge problem for those who are quick learners and have others around them (at home or school) who will correct the inevitable errors (like the one pointed out by the OP). It may become more of a problem for those who are entirely dependent on Khan Academy (or similar online sources) for all of their education, which is not who it was intended for, and there can't be too many who are in that position.

A number of educators do take issue with Khan, but no one else seems to have put the effort in to supplant him rather than simply criticise.