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Discover LudwigThe phrase "are invalid" is correct and usable in written English.
It can be used to indicate that something does not hold validity or is not acceptable in a given context.
Example: "The results of the experiment are invalid due to the lack of proper controls."
Alternatives: "are not valid" or "are deemed invalid."
Dictionary
are invalid
verb
To exempt from duty because of injury or ill health.
synonyms
Exact(59)
"Any other designations are invalid".
These are invalid under the Unfair Contract Terms Act.
Mr. Moshman contends the petitions against him are invalid.
But the reasons why it was attacked are invalid.
Entries made through agents/third parties are invalid.
The association argues that many of the leases are invalid under federal law.
The first is that Iraq's debts are invalid because they were accumulated under Saddam Hussein's regime.
The city has hit back, saying the signatures are invalid on a technicality.
The appeals court also said Transkaryotic can argue again that three Amgen patents are invalid.
Alternatively, the suit seeks a ruling that the patents are invalid or unenforceable.
Apotex, a Canadian generics maker, contends in a lawsuit that the Plavix patents are invalid.
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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