Now lets take what we know, and work backwards from that.
There is no classification system for animals outside of Earth.
So lets assume that Krypton and Earth are treated as the same planet. Krypton likely, and even cannonlogically is a ‘super earth’ in speculative xenobiology. What would we name the species besides Kryptonian?
Also I agree. While the theory wreaks of anthropic principle it’s not unreasonable. Cosmologist predict their may be plenty of planets that are exact copies of Earth, even with doppelgangers of you and me in extreme circumstance. In this case, Biologist might decide to use almost exact naming conventions as here on earth. If someone from another planet has the same genetics and evolutionary timeline as a human on earth, it would suit biologist greatly to just name them after us, with some prefix to indicate they’re from another planet.
Now my mistake might be that we’ve only had one clade of animals I know of that’s named after resembling another clade. Homosapian however is the level of species. The naming conventions could have changed at different levels I don’t know.
Biologist might not like to call an animal like Kryptonian a ‘pseudohuman’ because they didn’t evolve specifically to resemble a human, they evolved on their own, away from humans, and happened to resemble a human.
In the Linnaean system, where animals are classified by physical traits. This is where I assume Superman would be compared to homosapians. However even the Linnaean system would account for the fact he can levitate and fire lasers from his eyes.
I prefer the Phylogenetic system, the one that says birds are reptiles, and makes clear that the domestic chicken, or broiler cock is in fact a descendant of the T-Rex.
What would you call Kryptonians?