Irving, I only brought it up because the bandage is just the right thing for jamming down inside a wound. It fills up the hole, absorbs some blood, and applies the clotting agent all at the same time. It's what combat medics carry, and I saw a video of it being used to great effect to stop a femoral artery bleed. As I understand it, the powdered clotting agents are not as highly regarded. Hopefully, Zombie Steve will chime in here.
I'm sorry I can't comment on the effectiveness of the product you linked.
Edit to add: I found the link to the video. It's a pig, by the way. Don't watch this if you're squeamish.
https://www.youtube.com/watch?v=Cj4gSDivxt0