Yep that's pretty much correct it come down to the manufacture emmc cards are a bit different then a standard hard drive, put it simply if it installs it will work if it don't load then it is RPMB protected then use the mmc-utils
you do not need to do anything except boot up the linux live usb it does not matter about Windows at this point, you are just looking at the emmc card to see if it is RPMB or not and for that you will need to install mmc-utils into the live Linux USB that is all. If there is no RPMB then you can simply install Linux and wipe Windows
You know on a SD card it has that little tab on the side that you can turn on write protect the card so you cannot write to it this is a similar principle - some have it, some do not