Even my C9* behaves exactly like my C1 or my Sony A80J in terms of LFC, all going down to >20. If the display can handle VRR and 120Hz, then there’s no point why LFC shouldn’t work on the B1. The GPU primarily determines whether LFC works or not.
*4k VRR Minimum: 40 Hz according to you guys. That is NOT correct and never was.