I eventually figured it out. The guide says
With the device powered off, hold Volume Down + Volume Up and connect USB cable to PC.
Now, click the button that the onscren instructions coorelate to “Continue” and/or “Unlock Bootloader”.
and on the screen the tablet displays
Volume up: Continue
This I assumed was a perfect implementation match for the ...
I just wish I could find someone who figured out a work around. From what I have read Google has intentionally blocked the change of bootloader lock.