5,000 watt 10,000 watt surge Pure Sine Wave Inverter

What is interesting is the factoids listed- for example, the 5000 watt model will not run anything over 2000 watts, according to the chart at the bottom, which also says you need a 1500 watt inverter to run a 20 watt florescent light.

I just don't see enough copper in that thing to be anywhere near a 5KW inverter, or even 2-2500 watt inverters (which is what I suspect it is).