ChaChin, the status means users' ranks in the channel, be that as op, halfop, owner, admin, etc...it's nothing to do with channel or status window per se. What does the code do is to replace Owner with 5, Admin with 4, Op with 3, HalfOp with 2, and Voiced with 1. This is a custom alias which you need to use $status() to call from it.

I reckon the code can be done as such:

alias status {
  return $+(<,$replace($iif($left($nick($1,$nick).pnick,1) isin $prefix,$v1),+,1,%,2,@,3,&,4,~,5),$2,>)
}

Then use

$status(#,$nick)

as the custom identifier.