I find this with a lot of assistive fonts, that they have claims but no research that says "Yes, this makes a dramatic difference". For example, the OpenDyslexic font I've never seen any research that it make any more difference yet I see people act like it's an answer. Big text is easier to read.
I attended a talk given on this font at an assistive technology conference recently. This seems to actually have a body of evidence demonstrating its benefits in specific use cases. Also from a design standpoint it truly is superior to alternatives. Things like dyslexia fonts are largely considered entirely ineffective in the field
