That's quite false. It makes no mention of throat-slittings.
The specific text you get when you are seriously wounded by an infiltrator (ie, the worst it can be), is
Even if he catches you sleeping, you always wake up in time to grab a dagger and at least try to defend yourself. Your wounds are body-wounds at worst, not neck-wounds.
And these days, it can even turn out to be not that bad—his blade missed the vital organs, or maybe the blood on your shirt was from a smaller scratch and the major wounds were only in your thigh and shoulder—and you only get a regular wound.
Which is stupid. He snuck in your tent and decides he will try to see if he is lucky when randomly stabbing the body instead of throat or head. It it's almost laughable ever he trying to call any infiltrator an assassin when history implies that all infils are idiots and can't ever actually kill someone.
