UL20276 core conductor specifications are the same of UL1571 in case of AWG#28(gauge size). So, the crimping condition is also the same.
Please use crimping condition of UL1571.
https://www.hirose.com/product/document?clcode=CL0901-4636-7-00&productname=AP105-DF52-2832P&series=&documenttype=CrimpCondition&lang=ja&documentid=066802040_DF52A-2832PCFA(UL1571)_CC