Your Windows 10 installation is probably sending quite a bit of information to Microsoft. Just what sorts of things are being sent, and could they be used to identify you or your activities?
You might be better off creating your new boot partition on an existing Linux box (using 'Startup Disk Creator') rather than using a Windows based ISO-to-boot program or DVD burner.
dd if=path-to-iso-image of=usb-partition-as-/dev/sdb
but you had to be aware of and transfer data in exact multiples of the block size.