No, LR not taking anticholinergic drugs nor do I know anyone who is on them (yet) but, from reading the article, the risk seems minimal & if someone does develop dementia whilst on the drug there are probably other contributory factors. Whatever medication is prescribed there is always the possibility of side effects.
If you & husband are really concerned go to your doctor and discuss it, even better if he is under the care of a hospital department. You may get some reassurance from that.