Wouldn’t a bows natural mechanical torque be the same every time you draw?
Yes it would. But listening to the video at 38 seconds the guy talks about setting the bow up to shoot center shot and talks about the "sweet spot" where a bow will shoot down the center. The only way to eliminate bow torque and get
most bows to shoot down the center of the riser is to grip the bow to straighten it back up. Most bows will not tune properly shooting down the center of the riser unless you grip the bow pretty hard.
I think this product is trying to provide the shooter instant information regarding the amount of hand torque they are subjecting to the riser. I think hand torque and mechanical torque are different things and the shooters enemy is more so the hand torque once the bow is properly tuned.
Am I wrong in thinking this?
No, you would be correct in thinking this. This is not how the owner is selling the product though. He's wanting the shooter to set up the bow to shoot down the center and to get a bow to do this you would have to grip the handle of the bow.
If the shooter adjusts it so that it and the pins align with the natural torque that nearly all bows exhibit so that you can see if you are doing something wrong because you are shooting from an awkward position then I can see it helping. Just not the way he seems to be trying to market the product.