To be clear, each newly generated NPR outtechs all the other NPR in existence at that time. At least that is what happened until now in that game. This includes newly created empires, star swarm and even rakhas. It might be intentional, but those bastards have racial armor tech 25, while I am sitting at 10, including a 70% bonus relic world.
Edit:
Rakhas are not a huge problem, as they are passive and happily sit on their rock. Everything else is a problem for everyone playing a game with a research speed that is not 100%.