That doesn't apply only to WSL2. As soon as you install the Hyper-V role (for WSL2 or to virtualize other VMs), your main OS becomes a VM with special hardware

That doesn't apply only to WSL2. As soon as you install the Hyper-V role (for WSL2 or to virtualize other VMs), your main OS becomes a VM with special hardware privileges (the Root Partition, in Hyper-V parlance), on top of the Hyper-V hypervisor kernel.