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Discover LudwigThe phrase "are not new" is correct and usable in written English.
It can be used to indicate that something is not recent or has been previously encountered or known.
Example: "These ideas are not new; they have been discussed in various forums for years."
Alternatives: "are not recent" or "are not original".
Dictionary
Exact(60)
Such calculations are not new.
"These aircraft are not new".
Such breaks are not new.
THE questions are not new.
Popularity rankings are not new.
They are not new groups.
The differences are not new.
Those qualms are not new.
Such indignities are not new.
These ideas are not new.
Negative attacks are not new.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com