Power Curling

Have you guys ever heard of this event? I was looking for a local meet, and I came across a full meet that includes a fourth lift. The power curl.

The qualifier for my weight class (220) in this event is 180 pounds. Man and I thought power lifters avoided curls!

Is this just a conventional curl or is this variation done with a biomechanical advantage of some sort?

Here’s the link.
http://members.aol.com/_ht_a/wnpf/rules.htm