Does 4 percent alcohol in non alcoholic beer affect final stage liver disease?

Four percent alcohol content is not non-alcoholic beer. It is moderately strong beer.

So-called non-Alcoholic Beverages must contain less that 1/2 percent alcohol, so the number you refer to is probably 0.4%, or .4%. This is not enough to have much effect on liver disease. However, if the person is alcoholic -- which most people in final stage liver disease are -- it is certainly enough to trigger their alcohol addiction and cause a relapse, which would almost certainly be fatal. We don't recommend it.