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The phrase "are unreliable" is correct and usable in written English.
It can be used to describe something or someone that cannot be trusted or depended upon.
Example: "The data from the old system are unreliable, leading to incorrect conclusions in our analysis."
Alternatives: "cannot be trusted" or "lack reliability".
Dictionary
are unreliable
adjective
Not reliable.
Exact(60)
But polls are unreliable.
JURIES are unreliable creatures.
Witnesses are unreliable.
Telephone communications are unreliable.
These are unreliable".
The telephone lines are unreliable.
Unfortunately, the machines are unreliable.
Opinion polls are unreliable and often contradictory.
Corruption is rife; courts are unreliable.
Many, it is true, are unreliable.
Supplies of local fish are unreliable".
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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