Hope I’m not wrong here,
but typical carb heat system was recommended to turn ON prior do app/landings if cold weather and possible freezing is expected. It can be clear to see maybe with RPM changes. This isn’t typical solution within known ice conditions because C1x2 isn’t certified generally to be effective here. I see this as some missunderstanding to fly into known ice conditions and set carb heat ON as solution with aircraft no certified for this. I see simply carb heat as prevention to not step to problem during specific procedure 