Why Hyper-V doesn't work in nyx 6.8 kernel?

I understand that Hyper-V build flags have been added to the kernel since the kernel came up to 6.8
However, in the nyx kernel, modified mmu.c and mmu.h, so Hyper-V doesn't seem to work properly. (Can't build)
Is there a reason for the modification? I want to use Hyper-V in nyx 6.8 kernel :(

https://github.com/IntelLabs/kafl.linux/commit/99f6245f99fa3fdd2008624b120aa2d4c7554fcb

Thanks!