Correct, Their are 3 power supplys and it is the oldest of the power supplies, but as you can tell it has largest capable output (203w). The 203w will work with all previous (150 and 175w) 360s. The xbox will only draw how much power it needs from the 203w.
The newer plugs are designed to not be able to fit 150w and 175w into 203w (of coarse), BUT only the 203w will fit into newer 360s (150w and 175w).

I had this power supply hooked up to my Falcon. As you can see from the chart you pulled, the Falcon calls for 175w.

This power supply will work with all non-slim XBOX 360s.. money back guarantee.

Thanks for the heads up though, I just was posting it here as I like to find deals and things for sale, even at places i'm not expecting it.
No Worries. Ill leave this up until it either does or doesn't sell.