The movie will likely jump back and forth between all these stories, but that’s a hard thing to predict perfectly with just trailer footage.
It’s an interesting idea of how Infinity War plays out, though, I’m not sure I agree with all of it.
It should also be noted that this editor did the same thing with Captain America: Civil War trailers and that got some key parts wrong as well.
I doubt that Thor’s storyline of meeting the Guardians of the Galaxy and then going on his mission happens entirely at the beginning of the movie and THEN cuts to the Earth people.