SMH. I think in the persuit of some profound secret to recording, people manage to overlook common simplicity.
He rapped the song the way it sounds recorded. That's why it sounds the same when you hear it live.
Put on a pair of headphones and just vibe to it.
You can tell he's layered a coulple doubles over some words he wanted emphasized. He also used delay(or manually repaeated)a few words for atmospehere of the song.
There are parts where he yells, parts where he impersonates the voice of his naysayers, ect.
This is called RECORDING.
This is why it can't be done in the living room of an apartment where neigbors will knock on the wall and tell you to shut up, or your mom will bang on your door and ask you what you're doing.
There is no "trick" or "secret" to recording good vocals. It's all in the performance. And although in 2000 that was a great mix, anyone with a daw and a $200 USB mic can achieve something close to it in 2010. If they give the equivalent performance.