just click a brick that tells youonactivate>client>displayvariable(player/client)[variablehere]
No.Not only would this be a pain to make, people can also look at their variables, then set down a brick and event it so their variable can be higher.
Because he doesn't let anyone go and mess around with variables, and his GUI probably doesn't even show the direct variable name. For example, Woodcutting Level probably isn't Player.var["Woodcutting Level"].