Once again - no.
You people think it worked only because it does work on medivia and most "oldschool" ots today. It didn't work in real old tibia though.
If you can't remember these times, then atleast make some research before you start to argue, cause it's already getting annoying. There are even original files out there, download them and check it yourself.
Attempting to teleport oneself with pot/chest would only result in loging on its top, simple as that. You needed another character (or monsters) in order to teleport yourself.
Blocking the roof completly wouldn't work either. You could stop facc people from going up by 3 parcels, which was pretty useful (and worked not only with pots and chests, but parcels too), but you still wouldn't prevent others from using exani hur up.