Hey Tobias,
I know the table you mean. There is an error in this table. They took the same value AWG10 for input and output for the single-phase input model, which can only be wrong. AWG10 is only valid for the input on 2.2 kW single-phase input model. On the output, you have the power on three phases shifted by 120° which means AWG12 or AWG13 is enough. I use 3 x 4.0 mm² (2+PE) at the single-phase input of VFD and shielded 4 x 2.5 mm² (3+PE) on the output (VFD to spindle).