Bradsky that article is bullshit. Reeves had a similar formula and it was equally useless.
I'm 176cm and have competed at 85kgs clean in 2005. I wasn't 5% but I would have been 7 and there isn't 9kgs in 2%. With a couple of years prep I believe I could be 90kgs in comp shape. I have also competed under 80 and looked like a plucked chicken at that weight.
Your muscular potential is where you decide to stop.
For a 6 foot male, 90 kgs should be like the 140/100/180 or whatever it is. That's about where you make it out of the novice category.