That seems like a stretch ta me.
Sky High just fumbled its attempt at telling a, "Chosen one without powers identifies with the oppressed, realizes he has powers and falls into the habits he had learned to hate, corrects his ways and becomes the role model he was supposed to be for everyone" story by being kind of a shit film, rather than it having a deeply and carefully crafted left-fascist ideology story.
Royal bloodline stories like that are inherently about teaching change through experience to someone who will become the defacto Person of Power, thanks to thousands of years of monarchy being baked in to storytelling, whereas MHA is more rooted in the position of power being one of nobility and inheritance which is basically the other side of that coin.
Hell, even Star Wars starts out with nobody slave Shmi Skywalker giving birth to space-Jesus Anakin, who has kids unlike other Jedi who don't seem to really ever have those relationships, so it's really a look at those mechanics from a different point of view, since Rey essentially got randomly chosen by the Force like Shmi, but she got to keep the powers herself, rather than just pass them on to a kid.
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