Well, I'm probably giving this stupid post too much credit but the theory doesn't make sense. While there is a theory that Slenderman can't get you if you don't look at him (as seen in the movie) - so that running away from him might really not be the best option -, what good would that do you with Jeff? He's not paranormal, so you'd just make it easier for him to walk over and "put you to sleep" if you don't attempt to run away :D
An interesting question is whether or not the movie has to be considered canon? I would basically say yes because Victor Surge was at least co-writer of the script..... It's a bit like what's going on with Disney's new Star Wars franchise: It changes things but it's still "new" canon.