Your bg is better so your file is automatically the real one
Haven't seen any of that drama myself (only saw foxfire's review mentioning the project alpha file but by no means claiming they were related) but I can see why people would end up thinking of the project alpha file (which is probably enhanced by the fact the song is a memorable banger and it's one of dour/sheen better files).
That being said, given the song structure and that both files like, actually follow the music, it's more surprising that they aren't
more similar lmao.
The overall density and target difficulty are already very different for starters, then there are notable differences in patterning even when both files are following pr or representing something with rolly patterns (which doesn't give that much room for variation in the first place).
Lastly, various sections are simply very different in both approach and focus (though not the first ~30s which is probably the amount of time people spent actually verifying anything).
Also, endymion is hardly an obscure song for anyone to be even bothered by resteps (not like resteps are even a problem in the first place).