GPU Passthrough - Does Win10 make it useless?

Hello,
In the latest episode of Level1Techs news, Wendell and Ryan shared this article:

The article states that Windows 10 collects a bunch of hardware data as well, such as your CPU serial number.
I was wondering if Windows 10 would be able to "see" that data if installed in KVM and if it does then is there a point to doing GPU passthrough with Win10?

Is it true that the most private way of doing things would be to have a separate PC just for gaming and since it will be used for just that and nothing else it wouldn't matter that it is Win10-based?

Thanks.