I can stealth kill anyone ?

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when i started game, there was option to go to basics tutorial with T-Bug,
one of the tutorial said that you can't always stealth kill, (snap neck) like that heavy armored trooper from ARASAKA,

But ingame i can stealth kill all minions i come across including those heavy armored arasaka troopers

Is this bug or i am missing something, i am playing on Hard difficulty.
 
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