I found that when I installed GIMP 3.0 through the Microsoft Store, and then installed G’MIC I ran into the 0xc0000022 problem as a number of DLLs were not found. When I installed GIMP with the .exe, it installed these missing DLLs in the GIMP bin directory and the G’MIC plug was able to run.
Mentioning that here in case anyone else ran into that.