I am also unable to find any reference on how exactly to apply this thrust limit penalty.
In addition to the take-off and and go-around performance mentioned above, another consideration would be the OEI ceiling. With total anti-ice on, the penalty can be as much as -4300 feet depending on ISA deviation and engine types.
Airbus has a table for the penalties in the event if engine anti-ice on or total anti-ice on, but not for wing anti-ice only. No idea why, or can we just infer and take the difference between the two for wing anti-ice on only?