You degenerate to ad hominem attacks pretty regularly within this forum. I question your ability of carrying out an intellectual discussion. And, I am pretty sure that I am right about you, and that is not ad hominem. I am happy to continue, but please stay on topic and respond to the ideas and discussion points, not your projection of the person, and avoid the hostility.
I raised the question of who funded, because the selection of devices seemed odd. I do not question the protocol or measured results. The weird looking thing is that it only studied four devices, and one of them was a Basis Peak. The AW and Fitbit Charge HR are no-brainers, because those two really are some of the most popular wrist HR trackers. But, it is missing a lot of others that are far more popular than the other two and better reflect the state of the market.