Discussion 4 Plates Of Wynn (shortcut??)

long time ago, me and a friend were just looking for solutions to the ??? quest.
I don't know if he had xray or something but he found some plates which he said that would work for something, like the stone plate in the prison in Ragni. So we needed 4 guys to do this trick, and there was some high level noob not believing us that those plates would work, he was like "lol thats just a plate to open the prison door".
Now later we found some people that wanted to help us do the trick, but after stepping on all 4 plates it said "access denied", or something.
There was even a moderator or admin watching us lol.
so after that happened one guy that helped us took screenshots from the text that the command blocks said, and posted it onto the forums, I can't find that post back, idk why.

So I would like to ask if anyone knows what it really does now, I think it would teleport the 4 players inside Yahya's house because first you need 4 players for the plate, and when we got teleported we could see a swampy-hallway, if you know what I mean.

I had some screenshots but sadly I deleted all of them a while ago.
Btw if you maybe still know the forums post from the guy that placed some pictures from the text, I was the guy that was hyped in those pictures.

regards