This rig is Sculp in Zbrush, retopo in Maya 2020 and Zbrush Zremesher ,Rigged using Advanced Skeleton 5, Textured in Substance Painter.
You can download Rig file for Maya 2020 on gumroad and in the link below:
https://twitter.com/ankush_4135/status/1307022261447086080?s=20
If you use this Rig please let me know, i will be happy to see it.