For now I'd say it's the Spider Wobble (looking at that video) but I wouldn't rule out the possibility that it's IBD. Just in case, I'd put him in quarantine in order to protect the other snakes. There are two things that come to my mind in your case:
1. Before I got my Bumblebee (Pastel + Spider) ball python, I had quite a long conversation with the breeder about the Spider gene. The married couple has been breeding ball pythons for many years and they told me that even a snake that was always fine can suddenly start to exhibit a very extreme case of the wobble. It is possible for sure but it happens rarely. I wonder if that might be the case with yours.
By the way the development goes both ways. A ball python with a severe wobble can become better to the point where the wobble is almost not noticeable.
2. IBD does not only come with corkscrewing. There are actually a few other symptoms to look out for. If you can say not to all of these questions, I think it's unlikely that it's IBD.
Doesn't the snake eat?
Have you ever seen the snake stargazing?
Have you ever noticed the tail of the snake twisting around?
Have you recently gotten any new snakes or is that snake new?
Did you ever see the snake having a seizure?
Does it look like the latter half of the snake's body is paralysed?
Does the snake appear disoriented?
Does the flickering of the tongue appear slower or has the tongue even stayed outside of his mouth for a longer period of time?
Does the animal appear slow?
Does the snake have different sized pupils (anisocoria) that only react to light tentatively?
If the snake lies on it's back, can't it go back to lying on it's stomach by itself?
If you suspect IBD to be the reason for the corkscrewing, bring the snake to the vet. It won't survive but at least you can protect it from suffering for a longer period of time.