Never heard of EPAT, but this is a key issue when dealing with Achilles issues……it is a low blood flow area, so the healing process can be lengthy. You need the healing properties of rich blood to stimulate healing.
This is why PRP was developed….it takes all the “healing” parts of your blood, separates them from the actual blood and is then injected directly into the injured area to stimulate healing.
Have no idea if EPAT does what it claims, but the idea behind it is certainly sound.