Did Chris Pratt Just Spoil Avengers 4?

It looks like Chris Pratt just posted a major spoiler for Avengers 4 online. We're jumping into the spoilers for Avengers: Infinity War right away, so now's your last chance to bail. Stephen McFeely and Christopher Markus, the screenwriters of Avengers: Infinity War and Avengers 4: Even More Infinity War Than Before, have stuck to their guns in saying that the heart-squeezing deaths you saw in the theater are real, saying: "the sooner you accept that, the sooner you will be able to move on to the next stage of grief." But in all honesty, fans know better than to listen to that crappy advice. And thanks to an accidental slip from Star-Lord actor Chris Pratt, their optimistic judgement has seemingly been proven right...