This would make more sense if it was 22 vegan men with plant-protein supplement and 22 carnivore diet men with animal-protein supplement and a control of typical diet with no supple

I read the "this" as the study too. I think the "this" is referring to the title so the comment is explaining how the title is an overreach and describing what sort of study you would need to justify a title like whatever overreach was made.

I'm guessing though