I don't have any HIPM/DIPM options in windows power plan advanced settings but while testing 13.1 I remember checking HIPM/DIPM entries in registry, all voices were set to 0 (like in this image), and APM stayed enabled anyway while switching every windows power plan.
So I suppose HIPM/DIMP settings are not involved.
you can force APM settings with Crystal Disk Info too (by checking the option called "Auto AAM/APM Adaption" that should apply your desired config on every reboot)