this study was funded by the National Institutes of Health and the National Heart, Lung and Blood Institute under grant numbers R21 HL135300 and R01 HL150053, as well as by contracts from the NIH/NHLBI funding the four field centers.

It says right on the study how it was funded, that guy was being sarcastic and rude which is why he was downvoted. If there is a bias in this study, it’s not immediately apparent from the funding.