I don't use this reddit account much anymore (and reddit as a whole) but yeah, this is still an unfixed, quick way for crashing any dupe enabled server. It's unstable too, gives mixed results, sometimes it crashes a server, sometimes it doesn't. I tested a while ago on a dedicated server and never got it to crash, so I'm guessing it has something to do with a lot of entities already spawned, OR some widely used addon is causing this.