The phrase "is partial" is correct and usable in written English.
It can be used to indicate that something is not complete or is biased in some way.
Example: "The report is partial and does not include all relevant data."
Alternatives: "is incomplete" or "is biased".
Dictionary
is partial
noun
A partial derivative: a derivative with respect to one independent variable of a function in multiple variables.
Exact(58)
What is partial oxidation?
He is partial to theatricality.
Much intelligence is partial, fragmentary.
(Every Trump disclosure is partial).
He is partial to Pink Floyd.
Nothing about what Bradford does is partial.
Ms. Middleton is partial to V-necks.
He is partial to drum circles.
(Mr. Butler is partial to prewar homes).
The superintendent of schools is partial to the root beer.
This is partial life, TV viewing with limited context.
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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