I disagree
Its only idiot fans that go off on it.
If its true, its true & explains a less than stellar performance.
He didn't take anything away from the winner, he just explained his situation.
Its a tough situation for fighters.
Like you said its completely true that being that sick will mess up your performance
and cause you to lose to a guy you would have normally beat.
Yet its also true if you point out that truth after the fight the collective MMA fanbase
will accuse you of making excuses.
The only other option is to not take the fight which will make you a default
pussy in the eyes of most of the garbage we call MMA fans
OR...
Don't say anything after the fight in which you are a default shitty fighter who got his
ass kicked against someone you shoulda beat in those same fans eyes.
You just cant win