Metaphysics is the study of "being qua being".
"[Aristotle] claims that each science studies a unified genus, but denies that there is a single genus for all beings". You're applying tautology without really understanding the construction of your own question.
https://academic.oup.com/edited-volume/28232/chapter-abstrac...
ELI5: asking about science isn't science. Like reading about painting isn't painting. Or more poetically, "Ce n'est pas une pipe"