How I thought about it was like when you let go of a freshly blown up balloon and it spirals around the room in a frenzy as the air escapes, not all balloons do this, it depends on a few different factors of the balloon, air pressure, and environment, so on. The difference between a balloon and manned space suit in the vacuum of space is that the suit is like an airplane that gets a hole-- everything gets sucked out or enough to block the hole. I came across an article that supports the unlikely odds of the "Iron Man scene" (http://www.outsideonline.com/2023396/how-accurate-martian)
I think Fox went with the alternative ending of the "Iron Man" for a couple reasons; fun because it's Iron Man and the Avengers are big in pop culture, readers get to experience the alt-ending from the book, and many of the crew members where also in marvel/super hero movie casting.
Weir confessed he never talked to Nasa about the specifics behind the Mars trip, he was just curious and enthusiastic about science and did some research. From your article, it appears that NASA approved their logo in the movie because there's aspects of the movie that are science fiction/can't be achieved with current technology.
I also recommend this Interview between Andy Weir and Adam Savage