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The phrase "is by" is correct and can be used in written English.
You can use it when you are describing the origin of something or someone, for example: "This painting is by Monet."
Dictionary
Exact(60)
Treatment is by psychotherapy.
This is by design.
That is by design.
Admission is by donation.
Pollination is by wind.
Everything is by hand.
The score is by Hindemith.
"It is by a waterfall".
Travel is by bus only.
The sweater is by TSE.
Foraging is by diverse modes.
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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