The EP can't initiate new law, but they can still vote on law proposed by the Commission, which does give them a certain amount of power. Your second link mentions MEPs doing back-room deals with the Commission and European diplomats, which they certainly couldn't do if they were entirely powerless.
I'm also skeptical on your claim that North Korea is the only other legislature where this secret law-making happens. Other autocracies aside, in any system with political parties, proposed legislation will most likely be circulated within the party for some time; then discussed informally with leaders of other parties that might be necessary for a majority, before it is first presented at a public hearing.