It depends on what you mean by for real. Norway is definitely well coached, all the players buy into the system and the system works very well and they play with extreme confidence at the moment, in that way they are for real, it isn't just luck that brought them their results. They are definitely playing better than what you would expect by looking at the roster, in that sense you could say they are overachieving.
I expect their journey to end against Russia, there is simply too big of a difference between the two teams. One thing I think has to be mentioned about the team is though, that their shooting% are extremely high, through out the team. Which means that over more games they wouldn't be able to keep up these kind of results. I'm not saying it to put them down, but it's just something that should be considered when talking about Norways play this WC. Where it's safe to say that, the stars have really aligned for Norway.