I feel as thought both graphs with purple and green lines are accurately explained. Were you trying to skim through the article or were you still left confused after reading it? The top one is explained in the accompanying text and the bottom one is explained with a labeled x and y axis and relies on the information provided above.
If the article describes the subject adequately, what is the point of the graphic? I found the interactive graphic more confusing than the description.
Compare and contrast to the clarity of their central limit theorem demonstation [1] vs its wikipedia page [2].
By that, I meant that the article described what the graph was representing, not that the article described the information presented adequately. Also, I absolutely disagree with the assumption you made that graphs shouldn't be present if the information is presented in the article. It's good to provide visual demonstrations when applicable in order to help clarify subjects.
