Orwell was wildly chauvinistic and 80% on board with fascism, going as far as to give the British government a list of suspected communists, noting the ones who were gay, at a time that was punishable by prison and/or castration.

But yeah, opposing an anti-war effort supports war, but it gets complicated when both sides are fascists. An American “pacifist” who wants to end the war in Ukraine by sending more weapons and money to Ukraine is not meaningfully different than a warmonger who supports the same policy. They might be worse as they can convince people who aren’t bloodthirsty ghouls that it’s just to send more bombs, each of which is a bad day for somebody, statistically mostly civilians. Conversely, a Russian “pacifist” who wants to end the war in Ukraine by sending another million Russians to Ukraine is not meaningfully different than Putin doing the same thing.

It’s different for actual wars of imperialism, say an Iranian or Cuban “pacifist” who wants to end the war by accepting foreign domination is just supporting fascism, which is closer to what Orwell was talking about if we’re a little charitable.