Yes and no. The images for "Die Accumulation" on that website do appear to be die deterioration error coins. The word "die accumulation" however, is not accurate - actually opposite to what the die would look like. The die would appear to have a concave surface at the point of the error, rather than a raised surface as the word would imply. When struck with a deteriorated die, coins will have extra raised areas, additional to the intended design.