“War is Peace” is doublespeak; an inherent contradiction. Anybody can say it and still see the contradiction and believe that it isn’t true. Doublethink is the internalization of that doublespeak. A Party member says it and sees no contradiction. Deep in their hearts, they understand that to be in a never ending war is to experience neverending peace.
All that to say that doublespeak was certainly a thing in the novel, as it labours on the distinction between doublespeak and doublethink.
this also works for navigating large crowds! you look slightly down and the direction you want to go and watch entire crowds part for you. some people will be oblivious and you may have to walk around them, but for the most part, people being able to subconsciously see where you want to go will make them move out of that way for you.