I do not understand how Carbide Copper is supposed to work

I have a dummy circuit with 2 traces and 6 holes.

I exported the PCB as Gerber, when I look into Carbide Copper I see this

I would expect Carbide Copper to mill out all green part an leave the copper for the traces, but it does the opposite, it mills out the traces.

For sure I am missing something obvious.

The all tiny project attached here

pcb.zip (11.7 KB)

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