For me, the idea of coding orc, or any other “non - humans” as fascist is a hard no. I have several reasons for that.
First the worldbuilding one, I just consider it a bit too unimaginative. It’s soo easy to attribute and transfer faults and negative characteristics of human society from real life, into a fantasy society. Like rather than creating a unique societies or flavors, traits, takes and twists, you just kinda sloppily put a sticker we all know and hate. I mean it can work, and I do believe in copying and recreating things from our world in fantasy worlds. Just in more nuanced, novel, interesting ways.
I’m also not a fan of the law = civilization = good vs chaos = wilderness = evil dichtomy. And this kinda plays into that.
In my games I use the concept of orc in the way that Romans or Greeks used the term “barbarian” as in those not belonging to their concept of society. I have groups of “Orcs” who intentionally use this label and create a monstrous image of themselves - in the way they present themselves to the outside world - as a thing of pride.
The second reason I disagree with this take is the political dimension. I know it might not be relevant for most people.
As someone who spends a lot of time doing active antifascist work and dabbles in the theory of fascism, what I see all too often is framing fascism as an “error” / “mistake” / “blunder” or otherwise something that is external to, or does not belong into “western” political thought. I believe, and there are many relevant scholars, which would argue the opposite - and that it stems from the same fundamental “Enlightenment” processes that created conservatism, liberalism or socialism. Hence fascism is a natural process, not mistake of, western political thought. The implications of this are numerous, i won’t go into details, but it is one of the reasons mainstream antifascism fails.
By externalizing something belonging to, in fantasy terms, Human society - and lets face it, most settings equate Human society in one way or another also to western societies - to a “non-human” society, we are following and reinforcing the same, fallacious way of looking at fascism as a phenomenon. Fascist are ordinary day to day humans, not some monsterous “others”.
I do use fascism in my games, in specific contexts, but only as a thing of some Human societies. If you want to have a look at how fascism can be translated into a more (low)fantasy context I recommend the book Hard to be a God by Arkadij and Boris Strugackij, really great take that can be applied to settings based in settings modeled medieval/renaissance/early modern western societies.
then again as I always say play the game the way you enjoy. and hell cutting down some fascho orcs does sound like it can be fun.