Never a jw A lot of stuff said from the article aren't even prophecies. I don't know everything but yes Jehovah did tell Adam upon eating the fruit he would die. Obviously he didn't mean that exact day or his goal of getting the earth inhabited wouldn't happen.
Another says Cain was a fugitive but still had a good life. You do realize Jehovah gave Cain some kind of mark that if anyone struck down Cain they would receive punishment.