maybe add apond the set var to use it as a flood pro as well as using maybe the $iff
You should have added to this before you posted it tbh...

on *$:TEXT:/^!powerlevel$/iS:#:{
  if (!%powerlevel) { set -u5 %powerlevel $r(0,10000)
    msg # $iif(%powerlevel > 9000,12it's... It's... It's Over 9000!!!,$nick 12has a powerlevel of 4 %powerlevel 12!!)
  }
}