I didn't realize at first that the spin-off would be the ones who retain the legal liability but I suppose it makes sense with it being split off from the original company (which makes more sense than if Tylenol was sold to a third party).
What stock? Paracetamol was first synthesised over 150 years ago; it is the most generic of generic drugs. It's also, well, not a big profit centre for anyone; it costs practically nothing.
Edit: I was misremembering an ongoing lawsuit as having been resolved: https://www.nysd.uscourts.gov/MDL/22md3043