Bull****.
Clearly the damaged caused by the accident was repaired in the twenty years since and the
eight months of rehab therapy is what brought him to notice it. The spider is completely ****ing irrelevant, even if the venom had any effect on him it wouldn't magically repair a spinal injury.
If you've been paraplegic for twenty years it'll take a few months of physical therapy for the limbs to become responsive again, even after the damaged nerves in your spine have recovered.
Just the usual ****ty media slapping the word "miracle" on something to get ratings.