I didn't completely understand his statement either. Most people won't use 200W, but it's possible some will.
The 1 Watt figure, isn't really math, it's a measurement. Axiom puts 1 Watt of power into the speaker, holds a mic 1 meter away, and sees how loud it is. It's known as the speaker's sensitivity. The M80s actually get 91 dB from 1 Watt.