This graph clearly shows that AI is also shockingly bad at factual accuracy and at telling a news story in such a way that someone who didn't already know about it to understand the issues and context. I think you're misrepresenting this graph as being bad about sources, but here's a better summary of the point you seem to be making:

AI's summaries don't match their source data.

So actually, the headline is pretty accurate in calling it misrepresentation.