what i mean is that rpp has said before that they don't want to write a story that is actually about racism (or ig more specifically colonization) because that's a topic that gets viewed a particular way by westerners who are gonna be the most likely audience.
the problem is that if we're looking at the marginals in isolation their like allegories ig for certain psychological experiences. like even if the story is literally about aliens who are technically colonizers, the "actual" point isn't about colonization, culture or even the end of the world itself but more about personal psychological experiences like alienation and ipseity disturbances
if you've watched steven universe this was a criticism people had with the diamonds. they were basically space fascists who had their space fascism waved away with the power of love and this is a terrible conclusion for most people if you want to take the story being about alien invasion at face value but if you understand what steven universe is "actually" about is family dynamics and forgiveness then the ending does what it set out to do. homestuck gets mentioned alot when it comes to breadavota's influences but su is also one of the main influences rpp has mentioned
as for sar specifically i think the whole cultural angle wasn't a great move because it muddles the narrative purpose of the marginals from being about psychological experiences back to being colonizers again and i don't think it was actually planned with alot of thought. sar exists because rpp likes poland and wants a polish guy in there and the fact that sar's character ends up being ABOUT his cultural identity feels like something that happened by accident and that rpp is forced to now tackle
as for what i said here: "rpp has some particular beliefs about the topic that relates more to ph politics" some of the worldbuilding choices in breadavota already parallel tribalism in the ph where different tribal groups have conflict with each other and rpp cares more about that than they do "global" conflicts. specifically they've criticized before how what is usually called "filipino" culture is really just tagalog culture and other filipino cultures are forgotten are oppressed. rpp is critical of people who are really obsessed with the concept of a "national" identity as a result and i think this is what sar's character ended up as, since he's obsessed with his being anselirian. like if you view it from the angle rpp is come from you can kinda see what the point being made here is, but if you aren't aware of that then it looks like in poor taste to make a guy who is mad about his culture being colonized the villain
alternatively though you could interpret it as "sar is right about the culture shit but he's still an asshole because he's an abuser" and while i don't think this is the specific message of his character i don't think it's completely out there either. a big mistake was making sar faux-polish instead of faux-filipino because even if you understood his character as a criticism for a specific type of filipino it's still stupid as hell when he's not even filipino.