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Discover LudwigThe phrase "were no longer valid" is correct and usable in written English.
It can be used to indicate that something has lost its legitimacy or relevance over time. Example: "The previous agreements were no longer valid after the new regulations were implemented."
Exact(21)
In my case, the addresses pointed to Excite@Home's proxy servers; once those servers were shut down and stopped handling my Web requests, the addresses in my HOSTS file were no longer valid.
In a defiant performance in the Commons, Cable insisted the pre-election pledge to scrap tuition fees was "no longer feasible" and went on assert a broader principle that all commitments made by either of the two coalition parties were no longer valid.
At its craziest, this government by ignorance included the first dictator, Ne Win, suddenly wiping out people's savings by decreeing that three denominations of banknotes were no longer valid and then producing new denominations in multiples of nine because that was his lucky number.
The Mitwissers' daughter thinks about the suicidally rich James: "did he not comprehend what it was to be without papers, to have no passport, to cower before a uniform, to pay for forged papers, to bribe to get genuine papers, to learn afterward that they were no longer valid, never to have good papers, a genuine passport!
However, in the present day, these regressions were no longer valid to represent different populations and generations.
It is unknown if these were blanket spam attacks that put in incorrect addresses, people accidentally mistyping emails, or people/organizations that had not updated their email lists and were emailing people no longer at Indiana University (Bloomington) and whose email addresses were no longer valid.
Similar(39)
Old locations and habits are no longer valid.
The DNA promotion is no longer valid, according to Paula Santiago, a spokeswoman for the agency.
However, some properties of ordinary set operations are no longer valid for fuzzy sets.
These values are no longer valid for the case where continuity exists.
This paper considers two cases where the common conjunction assessment assumptions are no longer valid.
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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