Problem is, the singing voice you're talking about is gone. His middle range is somewhat shot, how I do not understand, but it is. This is his lower range (which got a lot lower in recent years) and then he's able to belt out high notes pretty decently, but everything in the middle (think of easy songs like WLOL) is shot, sadly. Add to that breathing/timing problems and you got what it is nowadays. But I don't see heavy filtering or any doctoring here, on the contrary, I think this is as raw as it gets and exactly how he sounds today.