No he saying by just changing the trigger and nothing else. You can buy the Beast with a swept back trigger or a forward trigger.

The distance from my wrist to the hook is fixed, if the trigger is forward or back won't have any direct effect on this distance. My kisser button and peep will line up just the same as will the tip of my nose to the string. I could take the trigger off and everything will still line up. Only thing changing with a different trigger would be the location of my finger to touch off the shot.