They are just built from officially reported numbers. You can learn from them, or ignore them, it's up to you. They are log graphs, so to make it easier for folks to understand their exponential nature, the doubling rates are shown in the straight dotted lines.
Personally, I don't believe the numbers from China or Iran. South Korea and Japan do show CV is containable. Interestingly, they both do mass-testing and everybody wears masks in public places, that is, cashiers and customers are not sharing exhaled breaths like we are.
