Yeah, under the rules established by RINGS, he did. I don't list Fedor as 30-0-0-2, as much as I'd like to.
Was it a stupid call? Yeah. So are plenty of judges decisions, but the fight has to be fought under the rules established by the organization and (if there is one) the sanctioning body.
Now, it's fair to point out that Fedor's loss would have been a No Contest under the modern incarnation of the rules, but we don't get to change it to a No Contest because the rules changed.
I guess what I wanted to say all along that if somebody loses the fight it doesn't necessarily mean the other guy was better. Arona is a good example of that.
"He who defeats himself is the mightiest warrior" - Confucius(I think)