I also have this issue.

My specific circumstances are Workstation 16 on Windows 10 Pro with WSL2 enabled (which I need, so can't disable Hyper-V).

I then want to run nested virtual machines using ESXi 6.5 through Workstation and I get a warning that the EPT feature on the CPU is not allowed to be enabled or not supported. If I disable it on the CPU tab of the VM, ESXi virtual machine does install but I am only allowed to have 32bit VMs that are nested.

The article you posted seemed a bit confusing - is it saying that if you had Hyper-V enabled in situations where prior to WS 15.5 you couldn't have Workststion installed/working whatsoever, but now you can - but the caveat being that you can't do what I'm trying to do?

Thanks!

Michael.