That is something I didn't mention directly because it was more spoilers, but since its quoted in that article...
I'm sorry, but this silver bullet thing is bullshit to me. The two characters have been around for decades and as far as I know, and correct me if I'm wrong Corvus, I very well may be and you're definitely more versed in their history than I am, this "silver bullet" element was never mentioned prior to yesterday. As I tried to explain to someone who is not a big Thanos fan, Drax was made to kill (or at least frustrate) Thanos, but that doesn't mean he could.
"I thought we covered it in today's issue. We put it as simply as possible--something about him being a silver bullet. And the closer he got to Thanos, the more focused on Thanos he became and the more that "silver bullet" ability/thing powered up."
So says the editor. I'm not fond of this explanation, however.
I'm sorry, I love Giffen as a writer, but I just can't accept that after if never being this way for decades explaining it away like that for the first time in the issue Thanos is actually killed by Drax justifies it. It would be like, though obviously a reversed situation, if Luthor was trying to kill Superman with Kryptonite but, hey, waitaminute! Earlier in this issue they said Superman isn't affected by Kryptonite anymore! He's always been vulnerable to it before, but we said in this very issue he's not anymore so that makes it ok! That's all the reasoning you need! Just buy it! We say its this way now so it is, it doesn't matter if it makes sense or not!
That said, I still hope there is more to it than he and Giffen are letting on. Also, if he did die so Mar-vell could return...badass is indeed the proper term.