Treating someone as subhuman is a wholly separate action from calling someone’s actions inhuman.

Yes, but one definitely leads to the other. The rhetoric informs the action; if one hears something enough times, they may eventually begin to believe it’s true.

I just simply can’t agree that calling someone inhuman for their oppressive actions towards another human being is anywhere near the same level as calling someone inhuman for simply existing.

Fair enough, we seem to agree on the larger issue here so I won’t force the argument. But perhaps you can at least agree that calling those oppressive actions inhuman is directly denying the fact that humans are perfectly capable of such great evils. Which, evidently, they are.