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Yes, but the point is its hard relative to other methods of displaying the data. If the point of designing an infographic is to make information easy for users to understand and visually pleasing, then using the relative area of circles may not be the best method because its not the easiest to understand. Lets not forget not everyone has the same ability to perceive the relative area of circles, whereas using something like a series of repeated square units would be much easier to understand for everyone, making the infographic a more powerful tool.

Obviously, there are a myriad of ways (judging by a quick google search) to skin this particular moggy. The point is that using these circles is not a misleading way of representing the data, or that they were incorrect, as originally claimed.