Thats interesting because I arrived at the same conclusion.

At first glance for me it really seemed like its a font strait out of a elementary grade level textbook. Maybe its the website layout, maybe its that the font is huge and spaced the same, I'm not sure.

As far as easier to read, I am on the fence versus monospaced computer fonts if its any better or not. I wonder what their research behind this is but the website started to bug me so I didnt dig deeper personally