Well in the lab just messing with it and found it can make moves like Sub Zero's b2 or Shinnok's B3 whiff completely by holding block and crouching and then letting go of crouch as they're doing the move , so basically you can make it whiff by fuzzy guarding as you probably would be anyways in a lot of cases. You don't have to hold block to do it, if you just neutral duck then stand at the right time it will make it whiff as well whereas if you're stand blocking or crouch blocking it connects everytime at the same range. Haven't tested it with any other moves, but it seems to only work with Alien afaik of course