Heliforce never had an operating certificate. Therefore they never had it removed.
In NZ you only need a 135 cert for pax work, or a 137 cert for Ag work. Heliforce only did 133 lifting ops, no cert needed. That included powerlines construction and water bombing for fires.
Whenever they wanted to do Pax work they just borrowed Precisions 135 cert, somehow you can stick an aircraft on a cert for a day or two, do some flying then not have to worry about 135 rules until next time you want to fly pax. The rest of us comply with the tighter pax carrying rules year round...