I finally remembered to try it after dark, as you can't see the alcohol flames in daylight. So, this is definitely a low pressure alcohol stove, just like the backpacking stove I have. The way it works is the heat from the fire in the center warms the fuel tank, helping to vaporize the alcohol and push the vapors out through the holes where they ignite. It actually works surprisingly well.
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I'm thinking that center tube is a place to plug in a missing pot support (grate). So I improvised and boiled some water:
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I didn't measure it, but it was about 1.3 quarts, and took 10 minutes to boil, uncovered, but it was a bit breezy... this type of stove needs a windbreak.
So now I'm just wondering just what its intended use is.