I'll copy the bit here that I just edited into my reply after you edited the first post:

In the face of your edit, I see that you’ve misunderstood the exploit. You need write access to the System Volume Information directory of your own USB stick, not anything on the target machine. It’s much easier to get access to things on a computer than it is to get access on one particular computer, and this exploit lets you jump from one to the other.

does bitlocker encrypt whole volume, or userdata folders? It's a performance issue to encrypt anything that doesn't need to be.