WinDbg: Ep.5 – Kernel Internals

Question 9: Looking at the system process and the !token command, what is the User field?

What I did:

[...]
lkd> !process 0 0
**** NT ACTIVE PROCESS DUMP ****
PROCESS ffffdf0609685200
    SessionId: none  Cid: 0004    Peb: 00000000  ParentCid: 0000
    DirBase: 001aa002  ObjectTable: ffffc8001ac04d40  HandleCount: 1895.
    Image: System
lkd> dt nt!_eprocess ffffdf0609685200
[...]
lkd> !token
Thread is not impersonating. Using process token...
_EPROCESS 0xffffdf060f46e080, _TOKEN 0x0000000000000000
TS Session ID: 0x2
User: S-1-5-21-926794839-1820024918-4247477861-500

Is it possible the Lab was migrated to a new OS?
Or what do I miss here?