The phrase "is reductive" is correct and usable in written English.
It can be used to describe something that oversimplifies a complex issue or idea.
Example: "The argument presented in the article is reductive and fails to consider the nuances of the topic."
Alternatives: "is oversimplifying" or "is simplistic."
Dictionary
is reductive
adjective
Pertaining to the reduction of a decree etc.; rescissory.
Exact(59)
Ultimately, his point, too, is reductive.
Anika's crazy ex-girlfriend storyline is reductive.
But not everything the network does is reductive.
This, says Duncan Macmillan, is reductive for everyone.
"The convention of realism is reductive," he says.
To call her a 'female artist' or a 'feminist artist' is reductive.
You could call it crossover, but to term Ms. Upshaw a crossover artist is reductive.
But this cuddle is reductive; it shrinks the city's unruly sprawl to the tastes of outsiders.
"Film is reductive to a single protagonist, but a series allows you a degree of latitude.
I agree that the acronym is reductive, but isn't she missing the point?
It is reductive, and exposes an ugly irony that I'm sure Mr. Hurlin did not intend.
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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