I would say I'm fire.
Some of my training partners would say I'm metal. :-)
I call shenanigans on the article though... overtraining is overrated, almost impossible to do, natural or otherwise, in a real athlete that is conditioned for frequency and volume.
I've known plenty of natural lifters that hit 80% on their lifts 6 days a week. Overtraining, for the most part, is completely ignored in the Olympic weightlifting world as a non-issue perpetrated by the bodybuilding community.