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Did I miss something in school? Plenty of things heavier than helium aren’t metal. Boron, carbon, nitrogen, oxygen, fluorine, neon…
In astronomy, nearly everything is hydrogen or helium. Like, over 98% of all matter is H or He. So it's very useful to be able to talk about H, He, and "everything else". They call that everything else "metals".
Not for astrophysicists. They call basically everything a "metal". Of course they know it's wrong. But they keep doing it to annoy the chemists, I think.
We also label things as prime to trick mathematicians into thinking a derivative has occurred
Can speak only for myself, but yes absolutely correct.
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