I believe him. He didn't look right just before the fight. Looked like a guy who was already beaten. Something was going on with him, mentally or physically that was different from any of his other fights.
Regardless, it's still lame for him to say it. Should have just kept it to himself and taken the loss like a man, rather than try to excuse it. It's not like it's going to make a difference anyway, haters will hate, and those who know he was off don't need or want his excuses.