Benevo Cat foods contain all the nutrients an adult cat needs, including a wide range of vitamins (including A, B, D, E, K), essential fatty acids and taurine, without the need for slaughterhouse meat.
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Benevo Cat is a professional cat food, created by Benevo in 2005, formulated and checked by independent animal nutritionists to meet the AAFCO(USA) and FEDIAF(Europe) guidelines for animal nutrition.
https://www.aspca.org/news/why-cant-my-cat-be-vegan
Also there are people with horror stories as well
https://www.benevo.com/vegan-cat-food-from-benevo/
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shrug
Looks like they solved this problem 20 years ago.