My problem with the analog reader it they are usually quite off. Also except in that video the snake isn't on the top of the cage. So you need to find out what they are on the bottom. I understand that you guys have a system. I think there's things to change to make better for him bc when you have stressed, too hot or too cold snake you are making yourself prone to sickness and other issues.Seeing as though your worried about vet costs keeping him with above par temps and husbandry would prevent vet visits. This seems like a recent change, or environmental thing. Maybe he really has got to poop but temps could be the culprit of that and I've had snakes that really had to go and they weren't doing that. Dehydration also causes constipation but again ive never seen a snake do what yours is doing. So in my opinion you need to get the temps to recommend level, on the floor of the cage, see if that changes anything. Let him completely destress, and I'm
Happy to hear your going to rake this guy to the vet. At the same time I highly suggest fixing the little bugs in your system so you can prevent Anymore issue from arising.