If you tell me that all I need to do to negate the security concern of the kernel level anticheat is to run the dualboot windows partition…

…it makes intuitive sense that installing a kernel level anticheat would only affect the windows kernel it was installed on not the linux kernel on the other drive partition.

The intuition is incorrect if acknowledging that the kernel-level anticheats are not necessarily trusted. Operating systems interact with low-level hardware and firmware on the system. As such, it is not self-contained.

https://www.kaspersky.com/about/press-releases/more-elusive-and-more-persistent-the-third-known-firmware-bootkit-shows-major-advancement

There exists both UEFI bootkits and firmware implants. Its intuitive if you understand it like this: if there exists a communication pathway from (A) lower-privilege code -> (B) higher-privilege code, there exists the potential for vulnerabilities.

This is due to (A) now having an effect on the code execution for (B).