It doesn't, really.
1884 changed what was an important decision into a mere formality. But that's not the end of the story, the introduction of a vote of no confidence is far more important. After all, Norwegian governments are never affirmed, they are only thrown. So, who has the power to throw the government is extremely important. That the legislative could do that, was not written in law until the constitutional changes in 2007. Still, the two votes of no confidence('28 and '63) were legally binding with no written law covering it, and indeed disallowed by the constitution.
The last sentence from wiki, about the King de facto appointing the government after an election without a majority(which is the rule, majorities are an exception) is pure rubbish. The writer of that wiki page seems to have very little understanding of how government functions....