I was impressed and appreciated that you followed the original source, despite the original being legitimate, to their source. Johns-Hopkins and Harvard are both highly accredited institutions, and since their primary goal is to do research and share it, they're less likely to be biased and more research focused. You could add further research from other institutions, or follow Dimitrios Pappas work further to see if there are any motivators for him to share anything that supports an agenda or marketing scheme.