Based on the link in his HN profile, I think he's referring to himself: $110/hr, 5,337 hours worked. Those are impressive numbers.
I'm curious what he did to get to that level.
I notice that most projects he's actually billing around $50-60/hour - which is not that impressive for the US (probably much better where he lives). Maybe he stands out because his advertised rate is relatively high, and he cuts them a special deal each time?
The other thing is, why stay on UpWork after the connection is made, why not just build the client base and use UpWork as a lead source?
Maybe he starts with non-Upwork clients and then brings them "into" UpWork, getting 5 stars every time?
2 strict rules: 1) never negotiate rate, 2) don't work too hard (I prefer to work 40 hours per week).