Highend WP Theme iOS Icon sizes incorrect?

Looking at the Highend Theme Options – General settings and the iOS Icon sizes appear to be a bit off. Apple has a “Icon and Image Sizes” guidelines document on their website which lists different sizes found here https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html.

Is there a particular reason the theme options are different from Apple’s recommendations?

On a side note Apple’s site also provides good recommendations for how your .png file should be produced.