Maybe this is a nitpick but CoNLL NER is not a "challenging task". Even pre-LLM systems were getting >90 F1 on that as far back as 2016.
Also, just in case people want to lit review further on this topic: they call their method "programmatic data curation" but I believe this approach is also called model distillation and/or student-teacher training.
Also, just in case people want to lit review further on this topic: they call their method "programmatic data curation" but I believe this approach is also called model distillation and/or student-teacher training.