I was not saying about airgapped but in general, and Win OS is collecting data and all your activity even if you are not connected to the internet, so anyone who get's access to your computer will have that data.
I would say that is a security risk if you are thinking about choosing OS to use with electrum in arigapped system.
If someone has access to your offline, airgapped computer... you have much bigger issues than the fact they might be able to download some tracking metrics from Cortana I would say that is a security risk if you are thinking about choosing OS to use with electrum in arigapped system.
