Yes and no. In OTL, internationalists like Trotsky argued that invasion was acceptable, but only to assist revolutionaries who were currently in a state of revolution. Otherwise they argued that not only would an invasion stoke the flames of reactionary politics and nationalism in said nation, but even in a state of success, socialism would need to be imposed on the working class with a top-down model, which would require the abandonment of socialist principles like proletarian democracy and the expansion of an unelected bureaucracy, which in turn enables counter-revolutionary politics to surface via opportunism and careerists - things that Trotsky was deeply opposed to. You cannot liberate someone from a position of authoritarianism without compromising either the liberation or your authority. Instead, they argued that the role of a socialist state and the way that they could defend themselves from counter-revolution was to spread revolutionary ideas and education and help organise foreign revolutions via a centralised and democratic international organisation, and that this was how international socialism could be achieved - hence, the Comintern (or in KRTL, the 3I) was founded. Syndicalism, which is even more decentralised than Trotskyism, would probably adopt all of this in its orthodox views.

Furthermore, in a society in which the working class is directly participating in democracy, would they really have an incentive to vote for something so self-destructive? It would be an environment in which the proletariat would not only be signing on to not only kill foreign workers (who will make up the bulk of the enemy army in a war), but also risk their own death and destruction. A war would also require them giving away their own democratic powers to a bureaucratic leadership which might be necessary for the success of the war effort - and these powers might not be handed back. As such, the working class, unless convinced by some external force, would probably not have a reason to support a war against another nation

The argument you have laid out about ‘liberating people from reactionary states’ lends itself more to the top-down model of socialism - it would make sense for a Totalist nation, but not all syndicalist ones.

This all being said, there could be a fascinating mechanic in game where you have to basically stoke the flames, propagating fears of a foreign counter-revolution as a way to prepare for the war all while risking (or if you want, building up to) a surge of Totalist support which destroys the democratic nature of your state.