I have quite a few family members that died from cancer and wishing that upon somebody is such a piece of shit thing to do. He probably apologized because he got called out on it. Shitty peoplw like him are better of dead.
I have family members that died of cancer too. I also know what it's like to get so pissed off at someone that you just say something incredibly hurtful. Especially when it was clear that they didn't care about him at all and were just trying to make him angry.
Read that article about him. One shitty thing he said 8 years ago out of pure frustration because of a troll doesn't erase the good that he did and it doesn't make it okay to be glad he's dead or mock his death publicly.