A couple of things:
While the videos show behavior that COULD be attributable to IBD, there are numerous diseases/ailments that have the same presentation of neurological symptoms. Some are viral, some bacterial, some chemical and some due to husbandry errors
I would take a large grain of salt with any video that is not accompanied by a necropsy or histopathology report that confirms the disease. Many snakes with IBD never show neurological symptoms. The fact that a snake is stargazing, corkscrewing, spiraling, etc. is not a diagnosis of anything.
Additonally, some vets claim IBD and recommend euthanasia of the snake without any positive diagnosis.
In the past videos have been posted of supposed IBD-afflicted snakes. After necropsy it was shown they had other issues - meningitis for example.