You need to shorten the trips so he can see you leave and come back before he has a chance to freak out. Then you gradually work up from there. Your neighbors might think you are nuts but literally, you walk out, close the door, open it and walk back in. Then grab a magazine or whatever, turn back around and walk out again. Go to your car, then turn around and come back. No barking? Good. Wait a few minutes, go back out, get in the car, start it, turn it off, get back out and walk back in the house. By now, Rogue should be thoroughly confused or bored to tears with your coming and going. Walk back out, get in the car and drive around the block, come back home, etc., etc. After a bunch of these trips, Rogue should start to get the idea it's okay when you leave because you always come back.
Ir really helps though, if you leave him where he wants to be in the house. The signs he is showing seem more indicitive of anxiety from the crate and seclusion. Muzzling in the crate could add to his risk of injury because it could get caught on something while he is trying to push himself out. And yes, there have been greyhounds who managed to squeeze completely out.... not all good endings either.
By the way, kudos to you for recording Rogue while you train him. To me, it just seems so important.
Jenn