Nvidia Shield Killswitch OTA question!

I have a friend who got a replacement tablet. He has his old one says still works and he turned off wifi and didn't apply any OTA yet. Is it safe to assume that the killswitch didn't get installed? I got him to send me a picture of the about info on settings just double checking here to make sure. He wan't a couple of bucks for it since there is no guarantee it would work.
Would it be safe to turn it off? Since I need to go fastboot to flash a custom rom. Also if the new one is activated that means the old one will get the silent ota? How does that work?
Anyway here is what build number is on his. Check attachment.

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