Oh please this is pure nonsense, Warcraft (long before World of Warcraft existed) was always tongue and cheek references to everything the creators think is cool, everything but the kitchen sink thrown in, no technical information about how anything works at all and a thin story to glue it together. This is no different. There has never even been an explanation in the games about where say magic in the universe of wow comes from or how beings learned to acquire it and use it, let alone how portals work or how any magical device works. Things just are and that's it. Even chronical hasn't covered any of this type of thing.
Also no people, Archimonde and Kil'Jaedan are pretty fucking dead. At the very least for sure, no question about it, they are never going to pop up again as some kind of big bad. That tends to be the case with huge lore characters once they have been made into raid bosses, with few exceptions. Especially not with a cinematic video shown when you have killed them.