Here's the thing that doesn't "smell right" with me. The body has defense mechanisms against this. They're called taste buds. If the lye was strong enough to kill someone, certainly there would be a taste and also the lye would burn the sides of the mouth and even the throat so much that the person drinking the beer would spit it out before they ingested enough to kill them. Also, if the lye was so strong to kill someone then the stomach would puke it up.